The current post has been adapted and modified from the following article: What the Early Church Believed: Sabbath or Sunday?. All emphasis shall be mine.

The following quotations show that the first Christians understood that Sunday became the Lord’s Day as a result of Christ’s resurrection, and therefore replaced the Sabbath. This is why believers gathered for worship on first day of the week.

The Didache

Chapter 14. Christian Assembly on the Lord’s Day

But every Lord’s day gather yourselves together, and break bread, and give thanksgiving after having confessed your transgressions, that your sacrifice may be pure. But let no one that is at variance with his fellow come together with you, until they be reconciled, that your sacrifice may not be profaned. For this is that which was spoken by the Lord: In every place and time offer to me a pure sacrifice; for I am a great King, says the Lord, and my name is wonderful among the nations. (The Didache [A.D. 70]).

Epistle of Barnabas

Chapter 15. The false and the true Sabbath

Further, also, it is written concerning the Sabbath in the Decalogue which [the Lord] spoke, face to face, to Moses on Mount Sinai, And sanctify the Sabbath of the Lord with clean hands and a pure heart. Exodus 20:8; Deuteronomy 5:12 And He says in another place, If my sons keep the Sabbath, then will I cause my mercy to rest upon them. Jeremiah 17:24-25 The Sabbath is mentioned at the beginning of the creation [thus]: And God made in six days the works of His hands, and made an end on the seventh day, and rested on it, and sanctified it. Attend, my children, to the meaning of this expression, He finished in six days. This implies that the Lord will finish all things in six thousand years, for a day is with Him a thousand years. And He Himself testifies, saying, Behold, today will be as a thousand years. Therefore, my children, in six days, that is, in six thousand years, all things will be finished. And He rested on the seventh day. This means: when His Son, coming [again], shall destroy the time of the wicked man, and judge the ungodly, and change the-sun, and the moon, and the stars, then shall He truly rest on the seventh day. Moreover, He says, You shall sanctify it with pure hands and a pure heart. If, therefore, any one can now sanctify the day which God has sanctified, except he is pure in heart in all things, we are deceived. Behold, therefore: certainly then one properly resting sanctifies it, when we ourselves, having received the promise, wickedness no longer existing, and all things having been made new by the Lord, shall be able to work righteousness. Then we shall be able to sanctify it, having been first sanctified ourselves. Further, He says to them, Your new moons and your Sabbath I cannot endure. Isaiah 1:13 You perceive how He speaks: Your present Sabbaths are not acceptable to Me, but that is which I have made, [namely this,] when, giving rest to all things, I shall make a beginning of the eighth day, that is, a beginning of another world. Wherefore, also, we keep the eighth day with joyfulness, the day also on which Jesus rose again from the dead. And when He had manifested Himself, He ascended into the heavens. (Ibid. [A.D. 74]) ​​​​​​​

Ignatius of Antioch​​​​​​​

Chapter 8. Caution against false doctrines

Be not deceived with strange doctrines, nor with old fables, which are unprofitable. For if we still live according to the Jewish law, we acknowledge that we have not received grace. For the divinest prophets lived according to Christ Jesus. On this account also they were persecuted, being inspired by His grace to fully convince the unbelieving that there is one God, who has manifested Himself by Jesus Christ His Son, who is His eternal Word, not proceeding forth from silence, and who in all things pleased Him that sent Him.

Chapter 9. Let us live with Christ

If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death — whom some deny, by which mystery we have obtained faith, and therefore endure, that we may be found the disciples of Jesus Christ, our only Master — how shall we be able to live apart from Him, whose disciples the prophets themselves in the Spirit did wait for Him as their Teacher? And therefore He whom they rightly waited for, having come, raised them from the dead. Matthew 27:52 (Epistle to the Magnesians [A.D. 110])

Justin Martyr​​​​​​​

Chapter 67. Weekly worship of the Christians

And we afterwards continually remind each other of these things. And the wealthy among us help the needy; and we always keep together; and for all things wherewith we are supplied, we bless the Maker of all through His Son Jesus Christ, and through the Holy Ghost. And on the day called Sunday, all who live in cities or in the country gather together to one place, and the memoirs of the apostles or the writings of the prophets are read, as long as time permits; then, when the reader has ceased, the president verbally instructs, and exhorts to the imitation of these good things. Then we all rise together and pray, and, as we before said, when our prayer is ended, bread and wine and water are brought, and the president in like manner offers prayers and thanksgivings, according to his ability, and the people assent, saying Amen; and there is a distribution to each, and a participation of that over which thanks have been given, and to those who are absent a portion is sent by the deacons. And they who are well to do, and willing, give what each thinks fit; and what is collected is deposited with the president, who succours the orphans and widows and those who, through sickness or any other cause, are in want, and those who are in bonds and the strangers sojourning among us, and in a word takes care of all who are in need. But Sunday is the day on which we all hold our common assembly, because it is the first day on which God, having wrought a change in the darkness and matter, made the world; and Jesus Christ our Saviour on the same day rose from the dead. For He was crucified on the day before that of Saturn (Saturday); and on the day after that of Saturn, which is the day of the Sun, having appeared to His apostles and disciples, He taught them these things, which we have submitted to you also for your consideration. (First Apology [A.D. 155])

The Didascalia

“The apostles further appointed: On the first day of the week let there be service, and the reading of the holy scriptures, and the oblation [sacrifice of the Mass], because on the first day of the week [i.e., Sunday] our Lord rose from the place of the dead, and on the first day of the week he arose upon the world, and on the first day of the week he ascended up to heaven, and on the first day of the week he will appear at last with the angels of heaven.” (Didascalia 2 [A.D. 225])

Origen

27. Significance of the Names of John and of His Parents.

The force that is in names may be applied in many matters, and it may be worth our while to ask at this point what is the significance of the names John and Zacharias. The relatives wish, as the giving of a name is a thing not to be lightly disposed of, to call the child Zacharias, and are surprised that Elisabeth should want him to be called John. Zacharias then writes, His name is John, and is at once freed from his troublesome silence. On examining the names, then, we find Joannes to be Joa without the nes. The New Testament gives Hebrew names a Greek form and treats them as Greek words; Jacob is changed into Jacobus, Symeon into Simon, and Joannes is the same as Joa. Zacharias is said to be memory, and Elisabeth oath of my God, or strength of my God. John then came into the world from grace of God (=Joa=Joannes), and his parents were Memory (about God) and the Oath of our God, about the fathers. Thus was he born to make ready for the Lord a people fit for Him, at the end of the Covenant now grown old, which is the end of the Sabbatic period. Hence it is not possible that the rest after the Sabbath should have come into existence from the seventh of our God; on the contrary, it is our Saviour who, after the pattern of His own rest, caused us to be made in the likeness of His death, and hence also of His resurrection. (Commentary on John, Book II [A.D. 229])

Victorinus

On the fifth day the land and water brought forth their progenies. On the sixth day the things that were wanting were created; and thus God raised up man from the soil, as lord of all the things which He created upon the earth and the water. Yet He created angels and archangels before He created man, placing spiritual beings before earthly ones. For light was made before sky and the earth. This sixth day is called parasceve, that is to say, the preparation of the kingdom. For He perfected Adam, whom He made after His image and likeness. But for this reason He completed His works before He created angels and fashioned man, lest perchance they should falsely assert that they had been His helpers. On this day also, on account of the passion of the Lord Jesus Christ, we make either a station to God, or a fast. On the seventh day He rested from all His works, and blessed it, and sanctified it. On the former day we are accustomed to fast rigorously, that on the Lord’s day we may go forth to our bread with giving of thanks. And let the parasceve become a rigorous fast, lest we should appear to observe any Sabbath with the Jews, which Christ Himself, the Lord of the Sabbath, says by His prophets that His soul hates; Isaiah 1:13-14 which Sabbath He in His body abolished, although, nevertheless, He had formerly Himself commanded Moses that circumcision should not pass over the eighth day, which day very frequently happens on the Sabbath, as we read written in the Gospel. John 7:22 Moses, foreseeing the hardness of that people, on the Sabbath raised up his hands, therefore, and thus figuratively fastened himself to a cross. Exodus 22:9, 12 And in the battle they were sought for by the foreigners on the Sabbath day, that they might be taken captive, and, as if by the very strictness of the law, might be fashioned to the avoidance of its teaching. 1 Maccabbees 2:31-41

And thus in the sixth Psalm for the eighth day, David asks the Lord that He would not rebuke him in His anger, nor judge him in His fury; for this is indeed the eighth day of that future judgment, which will pass beyond the order of the sevenfold arrangement. Jesus also, the son of Nave, the successor of Moses, himself broke the Sabbath day; for on the Sabbath day he commanded the children of Israel Joshua 6:4 to go round the walls of the city of Jericho with trumpets, and declare war against the aliens. Matthias also, prince of Judah, broke the Sabbath; for he slew the prefect of Antiochus the king of Syria on the Sabbath, and subdued the foreigners by pursuing them. And in Matthew we read, that it is written Isaiah also and the rest of his colleagues broke the Sabbath Matthew 12:5 — that that true and just Sabbath should be observed in the seventh millenary of years. Wherefore to those seven days the Lord attributed to each a thousand years; for thus went the warning: In Your eyes, O Lord, a thousand years are as one day. Therefore in the eyes of the Lord each thousand of years is ordained, for I find that the Lord’s eyes are seven. Zechariah 4:10 Wherefore, as I have narrated, that true Sabbath will be in the seventh millenary of years, when Christ with His elect shall reign. Moreover, the seven heavens agree with those days; for thus we are warned: By the word of the Lord were the heavens made, and all the powers of them by the spirit of His mouth. There are seven spirits. Their names are the spirits which abode on the Christ of God, as was intimated in Isaiah the prophet: And there rests upon Him the spirit of wisdom and of understanding, the spirit of counsel and might, the spirit of wisdom and of piety, and the spirit of God’s fear has filled Him. Isaiah 11:2-3 Therefore the highest heaven is the heaven of wisdom; the second, of understanding; the third, of counsel; the fourth, of might; the fifth, of knowledge; the sixth, of piety; the seventh, of God’s fear. From this, therefore, the thunders bellow, the lightnings are kindled, the fires are heaped together; fiery darts appear, stars gleam, the anxiety caused by the dreadful comet is aroused. Sometimes it happens that the sun and moon approach one another, and cause those more than frightful appearances, radiating with light in the field of their aspect. But the author of the whole creation is Jesus. His name is the Word; for thus His Father says: My heart has emitted a good word. John the evangelist thus says: In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by Him, and without Him was nothing made that was made. Therefore, first, was made the creation; secondly, man, the lord of the human race, as says the apostle. 1 Corinthians 15:45-47 Therefore this Word, when it made light, is called Wisdom; when it made the sky, Understanding; when it made land and sea, Counsel; when it made sun and moon and other bright things, Power; when it calls forth land and sea, Knowledge; when it formed man, Piety; when it blesses and sanctifies man, it has the name of God’s fear. (On the Creation of the World[A.D. 300])

Eusebius of Caesarea

Chapter 4. The Religion Proclaimed by Him to All Nations Was Neither New Nor Strange…

8. They did not care about circumcision of the body, neither do we. They did not care about observing Sabbaths, nor do we. They did not avoid certain kinds of food, neither did they regard the other distinctions which Moses first delivered to their posterity to be observed as symbols; nor do Christians of the present day do such things. But they also clearly knew the very Christ of God; for it has already been shown that he appeared unto Abraham, that he imparted revelations to Isaac, that he talked with Jacob, that he held converse with Moses and with the prophets that came after. (Church History, Book I [A.D. 312])

“[T]he day of his [Christ’s] light . . . was the day of his resurrection from the dead, which they say, as being the one and only truly holy day and the Lord’s day, is better than any number of days as we ordinarily understand them, and better than the days set apart by the Mosaic law for feasts, new moons, and Sabbaths, which the apostle [Paul] teaches are the shadow of days and not days in reality” (Proof of the Gospel, 4:16:186 [A.D. 319]).

Athanasius

“The Sabbath was the end of the first creation, the Lord’s day was the beginning of the second, in which he renewed and restored the old in the same way as he prescribed that they should formerly observe the Sabbath as a memorial of the end of the first things, so we honor the Lord’s day as being the memorial of the new creation.” (On Sabbath and Circumcision, 3 [A.D. 345])

Cyril of Jerusalem

37… Fall not away either into the sect of the Samaritans or into Judaism, for Jesus Christ has henceforth ransomed you. Stand aloof from all observance of Sabbaths and from calling any indifferent meats common or unclean. (Catechetical Lectures, Lecture 4 [A.D. 350])

Council Laodicea (390) [LOCAL]

Christians must not judaize by resting on the Sabbath, but must work on that day, rather honouring the Lord’s Day; and, if they can, resting then as Christians. But if any shall be found to be judaizers, let them be anathema from Christ. (Canon 29)

John Chrysostom

9… How was it then when he [God] said, “You shall not kill” . . . he did not add, “because murder is a wicked thing.” The reason was that conscience had taught this beforehand, and he speaks thus, as to those who know and understand the point. Wherefore when he speaks to us of another commandment, not known to us by the dictate of conscience, he not only prohibits, but adds the reason. When, for instance, he gave commandment concerning the Sabbath— “On the seventh day you shall do no work”—he subjoined also the reason for this cessation. What was this? “Because on the seventh day God rested from all his works which he had begun to make” [Ex. 20:10-11]. . . . For what purpose then, I ask, did he add a reason respecting the Sabbath, but did no such thing in regard to murder? Because this commandment was not one of the leading ones. It was not one of those which were accurately defined of our conscience, but a kind of partial and temporary one, and for this reason it was abolished afterward. But those which are necessary and uphold our life are the following: “You shall not kill. . . . You shall not commit adultery. . . . You shall not steal.” On this account he adds no reason in this case, nor enters into any instruction on the matter, but is content with the bare prohibition. (Homilies on the Statutes, Homily 12, [A.D. 387])

Ver. 17. But if, while we sought to be justified in Christ, we ourselves also were found sinners is Christ a minister of sin?…

“… You have put on Christ, you have become a member of the Lord and been enrolled in the heavenly city, and you still grovel in the law [of Moses]? How is it possible for you to obtain the kingdom? Listen to Paul’s words, that the observance of the law overthrows the gospel, and learn, if you will, how this comes to pass, and tremble, and shun this pitfall. Why do you keep the Sabbath and fast with the Jews? Is it that you fear the Law and abandonment of its letter? But you would not entertain this fear, did you not disparage faith as weak, and by itself powerless to save. A fear to omit the sabbath plainly shows that you fear the Law as still in force; and if the Law is needful, it is so as a whole, not in part, nor in one commandment only; and if as a whole, the righteousness which is by faith is little by little shut out. If you keep the sabbath, why not also be circumcised? And if circumcised, why not also offer sacrifices? If the Law is to be observed, it must be observed as a whole, or not at all. If omitting one part makes you fear condemnation, this fear attaches equally to all the parts. If a transgression of the whole is not punishable, much less is the transgression of a part; on the other hand, if the latter be punishable, much more is the former. But if we are bound to keep the whole, we are bound to disobey Christ, or by obedience to Him become transgressors of the Law. If it ought to be kept, those who keep it not are transgressors, and Christ will be found to be the cause of this transgression, for He annulled the Law as regards these things Himself, and bid others annul it. Do you not understand what these Judaizers are compassing? They would make Christ, who is to us the Author of righteousness, the Author of sin, as Paul says, Therefore Christ is the minister of sin. Having thus reduced the proposition to an absurdity, he had nothing further to do by way of overthrowing it, but was satisfied with the simple protestation,” (Commentary on Galatians, Chapter 2 [A.D. 395])

“The rite of circumcision was venerable in the Jews’ account, forasmuch as the law itself gave way thereto, and the Sabbath was less esteemed than circumcision. For that circumcision might be performed, the Sabbath was broken; but that the Sabbath might be kept, circumcision was never broken; and mark, I pray, the dispensation of God. This is found to be even more solemn than the Sabbath, as not being omitted at certain times. When then it is done away, much more is the Sabbath…” (Homilies on Philippians Homily 10 [A.D. 402])

The Apostolic Constitutions

That Every Christian Ought to Frequent the Church Diligently Both Morning and Evening.

LIX . When you instruct the people, O bishop, command and exhort them to come constantly to church morning and evening every day, and by no means to forsake it on any account, but to assemble together continually; neither to diminish the Church by withdrawing themselves, and causing the body of Christ to be without its member. For it is not only spoken concerning the priests, but let every one of the laity hearken to it as concerning himself, considering that it is said by the Lord: He that is not with me is against me, and he that gathers not with me scatters abroad. Matthew 12:30 Do not you therefore scatter yourselves abroad, who are the members of Christ, by not assembling together, since you have Christ your head, according to His promise, present, and communicating to you. Be not careless of yourselves, neither deprive your Saviour of His own members, neither divide His body nor disperse His members, neither prefer the occasions of this life to the word of God; but assemble yourselves together every day, morning and evening, singing psalms and praying in the Lord’s house: in the morning saying the sixty-second Psalm, and in the evening the hundred and fortieth, but principally on the Sabbath day. And on the day of our Lord’s resurrection, which is the Lord’s day, meet more diligently, sending praise to God that made the universe by Jesus, and sent Him to us, and condescended to let Him suffer, and raised Him from the dead. Otherwise what apology will he make to God who does not assemble on that day to hear the saving word concerning the resurrection, on which we pray thrice standing in memory of Him who arose in three days, in which is performed the reading of the prophets, the preaching of the Gospel, the oblation of the sacrifice, the gift of the holy food? (Apostolic Constitutions , Book II, Section 7. On Assembling in the Church [A.D. 400])

Augustine

Chapter 23 [XIV.]— How the Decalogue Kills, If Grace Be Not Present

Although, therefore, the apostle seems to reprove and correct those who were being persuaded to be circumcised, in such terms as to designate by the word  law circumcision itself and other similar legal observances, which are now rejected as shadows of a future substance by Christians who yet hold what those shadows figuratively promised; he at the same time nevertheless would have it to be clearly understood that the law, by which he says no man is justified, lies not merely in those sacramental institutions which contained promissory figures, but also in those works by which whosoever has done them lives holily, and among which occurs this prohibition: You shall not covet. Now, to make our statement all the clearer, let us look at the Decalogue itself. It is certain, then, that Moses on the mount received the law, that he might deliver it to the people, written on tables of stone by the finger of God. It is summed up in these ten commandments, in which there is no precept about circumcision, nor anything concerning those animal sacrifices which have ceased to be offered by Christians. Well, now, I should like to be told what there is in these ten commandments, except the observance of the Sabbath, which ought not to be kept by a Christian — whether it prohibit the making and worshipping of idols and of any other gods than the one true God, or the taking of God’s name in vain; or prescribe honour to parents; or give warning against fornication, murder, theft, false witness, adultery, or coveting other men’s property? Which of these commandments would any one say that the Christian ought not to keep? Is it possible to contend that it is not the law which was written on those two tables that the apostle describes as the letter that kills, but the law of circumcision and the other sacred rites which are now abolished? But then how can we think so, when in the law occurs this precept, You shall not covet, by which very commandment, notwithstanding its being holy, just, and good, sin, says the apostle, deceived me, and by it slew me? What else can this be than the letter that kills? (On the Spirit and the Letter [A.D. 412])

Pope Gregory I

“It has come to my ears that certain men of perverse spirit have sown among you some things that are wrong and opposed to the holy faith, so as to forbid any work being done on the Sabbath day. What else can I call these [men] but preachers of Antichrist, who when he comes will cause the Sabbath day as well as the Lord’s day to be kept free from all work. For because he [the Antichrist] pretends to die and rise again, he wishes the Lord’s day to be held in reverence; and because he compels the people to Judaize that he may bring back the outward rite of the law, and subject the perfidy of the Jews to himself, he wishes the Sabbath to be observed. For this which is said by the prophet, ‘You shall bring in no burden through your gates on the Sabbath day’ [Jer. 17:24] could be held to as long as it was lawful for the law to be observed according to the letter. But after that the grace of almighty God, our Lord Jesus Christ, has appeared, the commandments of the law which were spoken figuratively cannot be kept according to the letter. For if anyone says that this about the Sabbath is to be kept, he must needs say that carnal sacrifices are to be offered. He must say too that the commandment about the circumcision of the body is still to be retained. But let him hear the apostle Paul saying in opposition to him: ‘If you be circumcised, Christ will profit you nothing’ [Gal. 5:2]” (Letters 13:1 [A.D. 597])

FURTHER READING

EARLY CHURCH ON JEWISH CHRISTIANS AND LAW OBSERVANCE

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