The synod or council of Laodicea has been dated anywhere from 343 to 381 AD. It contains the list of biblical books that were deemed to be canonical, and therefore the only authoritative writings that could be read in the churches.
Canon 59
No psalms composed by private individuals nor any uncanonical books may be read in the church, but only the Canonical Books of the Old and New Testaments.
Canon 60
[N. B.— This Canon is of most questionable genuineness.]
These are all the books of Old Testament appointed to be read: 1, Genesis of the world; 2, The Exodus from Egypt; 3, Leviticus; 4, Numbers; 5, Deuteronomy; 6, Joshua, the son of Nun; 7, Judges, Ruth; 8, Esther; 9, Of the Kings, First and Second; 10, Of the Kings, Third and Fourth; 11, Chronicles, First and Second; 12, Esdras, First and Second; 13, The Book of Psalms; 14, The Proverbs of Solomon; 15, Ecclesiastes; 16, The Song of Songs; 17, Job; 18, The Twelve Prophets; 19, Isaiah; 20, Jeremiah, and Baruch, the Lamentations, and the Epistle; 21, Ezekiel; 22, Daniel.
And these are the books of the New Testament: Four Gospels, according to Matthew, Mark, Luke and John; The Acts of the Apostles; Seven Catholic Epistles, to wit, one of James, two of Peter, three of John, one of Jude; Fourteen Epistles of Paul, one to the Romans, two to the Corinthians, one to the Galatians, one to the Ephesians, one to the Philippians, one to the Colossians, two to the Thessalonians, one to the Hebrews, two to Timothy, one to Titus, and one to Philemon. (Synod of Laodicea (4th Century) https://www.newadvent.org/fathers/3806.htm)
FURTHER READING
The Old Testament of the Early Church
Gregory of Nazianus’ Biblical Canon
The Biblical Books of the Apostolic Canons
John of Damascus’ Biblical Canon
The Biblical Canon of the 5th-6th Centuries
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