This is according to the following link, https://www.jw.org/en/bible-teachings/questions/alpha-omega/ which also says, "This term occurs three times in the Bible. -Revelation 1:8; Revelation 21:6; and here at Revelation 22:13."
They then say at the end of the article, "Does Revelation 22:13 prove that Jesus is "the Alpha and the Omega?" The answer they give is "no," followed by this explanation.
The speaker at Revelation 22:13 is not specifically identified, and there are various speakers in this chapter.
This begs the question? Why were they so "dogmatic" when they clearly stated, "The Alpha and Omega" refers to Jehovah God, the Almighty?"
So to prove their contention that the speaker is not specifically identified they quote Professor William Barclay:
"Things are set down without any apparent order; ...and it is often very difficult to be sure who is the actual speaker." (The Revelation of John, Volume 2, Revised Edition, page 223)
Then the article continues to say
Thus, "the Alpha and the Omega" at Revelation 22:13 can be identified as the same Person given this title elsewhere in Revelation-Jehovah God."
So being a good Berean according to Acts 17:11 I checked out what Professor Barclay really said under the title,
THE CLAIMS OF CHRIST (Revelation 22:12-13)
22:12,13 Behold, I am coming soon, and I have my reward with me, to render to each man, as his work is. I am Alpha and Omega, the first and the last, the beginning and the end. You can read his complete analysis at the following site.
The Risen Christ once again announces his speedy coming; and he makes two great claims.
Now, one of the reasons the Jehovah Witnesses deny that this is Jesus Christ is included in their own article.
The term "the First and the Last" occurs at Revelation 1:17, 18 and 2:8. In these verses, the context show that the one referred to died and later returned to life. Thus, these verses cannot refer to God because never died.
However, Jesus died and was resurrected.
The short answer is that the one person of Jesus Christ has two natures, one human and one divine. It was the human nature that died, not His divine nature. One cannot help notice the obvious contradictions.
So here's the question: Why do the Jehovah Witnesses quote Professor William Barclay saying "it is difficult to be sure who is the actual speaker?" Clearly his words are taken out of context in that he identifies the speaker as being Jesus Christ in his commentary on Revelation 22:12-13.
The quote by Barclay was used by the JW's to demonstrate that Jesus Christ is "NOT" the speaker at Revelation 22:12-13. I then showed proof from Barclay himself that the speaker is Jesus Christ. This is according to the context which includes Revelation 22:16, "I, Jesus have sent My angel to (not Michael the arc angel) to testify to you these things for the churches. I am the root and the offspring of David, the bright and morning star."
"The bright and morning star." Please read (Psalm 84:11, Malachi 4:2; Matthew 17:2; Revelation 1:16; 2 Peter 1:19.) Finally, Revelation 22:20:20-21, "He who testifies to these things (what things?) says, Yes, I am coming quickly. Amen. Come Lord Jesus. Verse 21, "The grace of the Lord Jesus be with all/the saints. Amen."