According to the inspired Scriptures, the prophet Isaiah was allowed to see Jehovah God Almighty in a visible form, where he appeared to be visibly seated on a visible throne wearing a robe:
“In the year that King Uz·ziʹah died, I saw Jehovah sitting on a lofty and elevated throne, and the skirts of his robe filled the temple. Seraphs were standing above him; each had six wings. Each covered his face with two and covered his feet with two, and each of them would fly about with two. And one called to the other: ‘Holy, holy, holy is Jehovah of armies. The whole earth is filled with HIS GLORY.’ And the pivots of the thresholds quivered at the sound of the shouting, and the house was filled with smoke. Then I said: “Woe to me! I am as good as dead, For I am a man of unclean lips, And I live among a people of unclean lips; For my eyes have seen the King, Jehovah of armies himself!’
“At that, one of the seraphs flew to me, and in his hand was a glowing coal that he had taken with tongs from the altar. He touched my mouth and said: ‘Look! This has touched your lips. Your guilt is removed, And your sin is atoned for.’
“Then I heard the voice of Jehovah saying: ‘Whom shall I send, and who will go for US?’ And I said: ‘Here I am! Send me!’ And he replied, ‘Go, and say to this people: “You will hear again and again, But you will not understand; You will see again and again, But you will not get any knowledge.” Make the heart of this people unreceptive, Make their ears unresponsive, And paste their eyes together, So that they may not see with their eyes And hear with their ears, So that their heart may not understand And they may not turn back and be healed.’” Isaiah 6:1-10
On the other hand, John’s Gospel teaches that this is the time when Isaiah actually saw Jesus in his prehuman existence:
“Then the crowd answered him: ‘We heard from the Law that the Christ remains forever. How can you say that the Son of man must be lifted up? Who is this Son of man?’ So Jesus said to them: ‘The light will be among you a little while longer. Walk while you still have the light, so that darkness does not overpower you; whoever walks in the darkness does not know where he is going While you have the light, exercise faith in the light, so that you may become sons of light.’ Jesus said these things and went off and hid from them. Although he had performed so many signs before them, they were not putting faith in him, so that the word of Isaiah the prophet might be fulfilled, who said: ‘Jehovah, who has put faith in the thing heard from us? And as for the arm of Jehovah, to whom has it been revealed?’
“The reason why they were not able to believe is that again Isaiah said: ‘He has blinded their eyes and has made their hearts hard, so that they would not see with their eyes and understand with their hearts and turn around and I heal them.’ Isaiah said these things because he saw HIS GLORY, and he spoke about him. All the same, many even of the rulers actually put faith in him, but they would not acknowledge him because of the Pharisees, so that they would not be expelled from the synagogue; for they loved the glory of men even more than the glory of God. However, Jesus called out and said: ‘Whoever puts faith in me puts faith not only in me but also in him who sent me; and whoever sees me sees also the One who sent me. I have come as a light into the world, so that everyone putting faith in me may not remain in the darkness.’” John 12:34-46
The Apostle cites Isaiah 6:10 and states that Isaiah said these words because he had seen Jesus Christ’s glory and spoke of him. John then immediately follows this up by quoting the Lord himself clearly stating that to see him is to see the One who sent him, meaning, the Father.
Nor is this the only place where Jesus made such a remarkable claim:
“Jesus said to him: ‘I am the way and the truth and the life. No one comes to the Father except through me. If you men had known me, you would have known my Father also; from this moment on you know him and have seen him.’ Philip said to him: ‘Lord, show us the Father, and it is enough for us.’ Jesus said to him: ‘Even after I have been with you men for such a long time, Philip, have you not come to know me? Whoever has seen me has seen the Father also. How is it you say, “Show us the Father”? Do you not believe that I am in union with the Father and the Father is in union with me? The things I say to you I do not speak of my own originality, but the Father who remains in union with me is doing his works. Believe me that I am in union with the Father and the Father is in union with me; otherwise, believe because of the works themselves.’” John 14:6-11
The inspired Apostle himself wrote that no one has seen or could ever see God apart from the only begotten God making him known:
“No man has seen God at any time; the only-begotten god who is at the Father’s side is the one who has explained Him.” John 1:18
What this means is that Isaiah must have beheld the glory of the prehuman Christ since the prophet could not have looked upon or even heard from Jehovah apart from the Son revealing God to him.
To put this in simpler terms, the Jehovah whose glory Isaiah saw was none other than that of the Lord Jesus Christ himself.
Astonishingly, the Watchtower Bible and Tract Society of the Jehovah’s Witnesses agrees with this fact since it candidly admits that Jesus was present during the time the prophet saw Jehovah (whom the Society identifies as the Father). They base this on the words of Isaiah 6:8 where the Voice of the Lord asks, “Whom shall I send, and who will go for US (lanu)?”.
The Society explains the reason why Jehovah’s Voice spoke in the plural “Us,” is because Jehovah was speaking to his only-begotten Son and Word, the very One who later became the Man Christ Jesus:
13 Let us listen with Isaiah. “I began to hear the voice of Jehovah saying: ‘Whom shall I send, and who will go for us?’ And I proceeded to say: ‘Here I am! Send me.’”(Isaiah 6:8) The question propounded by Jehovah is clearly designed to elicit a response from Isaiah, as no other human prophet appears in the vision. It is unmistakably an invitation for Isaiah to be Jehovah’s messenger. But why does Jehovah ask, “Who will go for us?” By switching from the singular personal pronoun “I” to the plural pronoun “us,” Jehovah now includes at least one other person with himself. Who? Was this not his only-begotten Son, who later became the man Jesus Christ? Indeed, it was this same Son to whom God said, “Let us make man in our image.” (Genesis 1:26; Proverbs 8:30, 31) Yes, alongside Jehovah in the heavenly courts is his only-begotten Son.—John 1:14. (Isaiah’s Prophecy—Light for All Mankind, Chapter Eight. Chapter Eight Jehovah God Is in His Holy Temple, pp. 93-94 https://www.jw.org/en/library/books/Isaiahs-Prophecy-Light-for-All-Mankind-I/Jehovah-God-Is-in-His-Holy-Temple/; emphasis mine)
And:
In 778 B.C.E., the year Judean King Uzziah died, God’s prophet Isaiah beheld a vision of Jehovah on his lofty throne. “Whom shall I send, and who will go for us?” asked Jehovah. Isaiah volunteered, but Jehovah warned him that his fellow Israelites would be unresponsive to his declarations. The apostle John compared the unbelieving Jews of the first century to the people of Isaiah’s day, and noted: “Isaiah said these things because he saw his glory.” Whose glory? That of Jehovah AND OF THE PREHUMAN JESUS ALONGSIDE HIM in the heavenly courts.—Isaiah 6:1, 8-10; John 12:37-41. (Jesus—The Ruler “Whose Origin Is From Early Times,” The Watchtower Announcing Jehovah’s Kingdom—1998, p. 24 https://wol.jw.org/en/wol/d/r1/lp-e/1998445; emphasis mine)
Again:
3 Did this Greater Isaiah need a miraculous vision of Jehovah enthroned in his temple with seraphs attending upon him, such as the original Isaiah had had? No, for he had been the heavenly Son of God and had beheld “the King, Jehovah of armies,” on his heavenly throne itself, and enjoyed heavenly glory with Jehovah. (John 17:5, 11, 20-24) By laying aside his heavenly glory and by having his life force transferred from heaven to earth by Jehovah’s miraculous power, he had become the man Jesus Christ. (Luke 1:26-38; Phil. 2:5-11) The human name that Jehovah God commanded to be given his Son on earth was Jesus, which is the shortened form for Jehoshua. Its meaning corresponds with that of the name Isaiah, only in reverse order. Jesus (or Jehoshua) means “Jehovah Is Salvation,” whereas Isaiah means “Salvation of Jah (Jehovah).” This circumstance goes well with the fact that Jesus Christ is the Greater Isaiah. Before becoming a man, he as the heavenly Son of God had been with Jehovah at the time that He said to the prophet Isaiah in the temple vision: “Who will go for us?” that is, ‘for me Jehovah and FOR my only-begotten Son.’—Isa. 6:8. (Have You Said: “Here I Am! Send Me”? The Watchtower Announcing Jehovah’s Kingdom—1966, p. 753 https://wol.jw.org/en/wol/d/r1/lp-e/1966922; emphasis mine)
Once more:
What “things” did Isaiah say “because he saw his glory”? Well, John quotes Isaiah here twice, first quoting Isaiah 53:1 concerning the ‘arm of Jehovah’ and then quoting Isaiah 6:10 concerning the temple vision. At Isaiah 53:1 the ‘arm of Jehovah’ is Christ Jesus. At Isaiah 6:10 the speaker at the temple is Jehovah, but HE INCLUDES HIS SON with him when he says: “Who will go for us?” that is, for me AND MY SON. Thus we see that the prehuman Jesus WAS ASSOCIATED WITH JEHOVAH IN HIS GLORY at the temple, and hence John could rightly say Isaiah here saw his glory and spoke about him, “the arm of Jehovah.” Certainly Jesus the Greater Isaiah had not sent himself, but Jehovah at the temple did so, for John here applies Isaiah 6:10 to Jesus as the Sent One toward whom this prophecy was first fulfilled, after Jesus had ridden into Jerusalem and offered himself as King and had cleansed the temple. … Especially since his resurrection, Jesus is the reflection of Jehovah’s glory.—Heb. 1:2, 3; 2 Cor. 4:6. (“Commissioning of Witnesses in the Time of the End,” The Watchtower, April 1, 1951, p. 219; emphasis mine)
Finally:
The Jews’ lack of faith in Jesus fulfills the words of Isaiah about the ‘eyes of people being blinded and their hearts being hardened so that they do not turn around to be healed.’ Isaiah saw in vision the heavenly courts of Jehovah, including Jesus in his prehuman glory along with Jehovah. Yet, the Jews, in fulfillment of what Isaiah wrote, stubbornly reject the evidence that this One is their promised Deliverer…
▪ How did the prophet Isaiah see Jesus’ glory? (The Greatest Man Who Ever Lived, Chapter 104. God’s Voice Heard a Third Time https://www.jw.org/en/library/books/The-Greatest-Man-Who-Ever-Lived/Gods-Voice-Heard-a-Third-Time/; https://wol.jw.org/en/wol/d/r1/lp-e/1989882; emphasis mine)
The Society’s candid acknowledgement that Isaiah beheld the glory of Jehovah and his preexistent, prehuman Son, and that it was with/to the Son whom Jehovah spoke in Genesis 1:26 in the creation of mankind raises serious problems for Jehovah’s Witnesses.
Isaiah 6 emphatically testifies that the prophet saw Jehovah’s glory alone, not the glory of God and a creature. Moreover, the context of Genesis 1:26 makes it explicitly clear that God alone created mankind in his own image and after his own likeness:
“Then God said: ‘Let us make man in our image, according to our likeness, and let them have in subjection the fish of the sea and the flying creatures of the heavens and the domestic animals and all the earth and every creeping animal that is moving on the earth.’ And God went on to create the man in HIS image, in God’s image HE created him; male and female HE created them.” Genesis 1:26-27
“This is the book of Adam’s history. In the day that God created Adam, HE made himin the likeness of God. Male and female HE created them. On the day they were created, HE blessed them and named them Man.” Genesis 5:1-2
“This is a history of the heavens and the earth in the time they were created, in the day that Jehovah God made earth and heaven. No bush of the field was yet on the earth and no vegetation of the field had begun sprouting, because Jehovah God had not made it rain on the earth and there was no man to cultivate the ground. But a mist would go up from the earth, and it watered the entire surface of the ground. And Jehovah God went on to form the man out of dust from the ground and to blow into his nostrils the breath of life, and the man became a living person. Further, Jehovah God planted a garden in Eʹden, toward the east; and there HE put the man whom HE had formed… Now Jehovah God had been forming from the ground every wild animal of the field and every flying creature of the heavens, and he began bringing them to the man to see what he would call each one; and whatever the man would call each living creature, that became its name. So the man named all the domestic animals and the flying creatures of the heavens and every wild animal of the field, but for man there was no helper as a complement of him. So Jehovah God caused the man to fall into a deep sleep, and while he was sleeping, HE took one of his ribs and then closed up the flesh over its place. And Jehovah God built the rib that he had taken from the man into a woman, and HE brought her to the man. Then the man said: ‘This is at last bone of my bones And flesh of my flesh. This one will be called Woman, Because from man she was taken.’ That is why a man will leave his father and his mother and he will stick to his wife, and they will become one flesh.” Genesis 2:4-8, 19-24
Therefore, these others whom God called upon to create humanity in their image and after their likeness, could not have been created beings. Rather, these other individuals who assisted God in creating male and female as the one Adam, could only have been eternal divine Persons who are essentially coequal with God the Father.
And since the Society admits that it was the prehuman Jesus that Jehovah spoke with/to, this means that Christ is not a creation of the Father, but is the uncreated Son of God who is equal to the Father in essence, power, glory and majesty (Cf. John 5:18, 22-23; 10:27-33; 8:50, 54; Rev. 5:13-14).
As such, the JWs are simply wrong to assert that Christ is the first creature whom Jehovah produced, being the archangel Michael both in his prehuman and post mortem existence.
Instead, the God-breathed Scriptures describe Jesus Christ as the uncreated Word of the Father who became flesh, the Son that has been eternally existing in God’s form who later took on human nature from the holy, consecrated womb of the Virgin by the power of the Holy Spirit, and will forever exist as the God-Man (Cf. Matt. 1:18-25; 2:1-6, 11; Luke 1:26-35; 2:4-15; John 1:1-4, 9-10, 14; Acts 2:24-36; 17:30-31; John 1:1-14; Phil. 2:5-11; 1 Tim. 2:5-6; 6:14-16; Col. 1:13-20; 2:2-3, 9-10; Heb. 1:1-3, 8-13; 2:9-18; Rev. 1:12-18; 2:8; 5:5; 22:12-16, 20-21).
Scriptural references taken from the New World Translation of the Holy Scriptures (Study Edition).
FURTHER READING
Jesus Christ: The God Whose Glory Isaiah Beheld
WHO DID THE PROPHETS SEE? A JEHOVAH’S WITNESS DILEMMA
JWS ADMIT: JESUS IS THE ETERNAL CREATOR!
Answering Islam Blog 
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