I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.
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Revelation 1:6-10
Tyndale Open Study Notes (CC BY-SA 4.0).
1:8 I am is the name of God in the Old Testament (Exod 3:13-14; 6:2; Deut 6:4). Jesus applied this name to himself (cp. John 4:26). Alpha and Omega are the first and last letters of the Greek alphabet; they signify that God’s actions are all-encompassing. God is fully in control.
Other Bible passages linked to this one, most cited first.
Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God.
I am Alpha and Omega, the beginning and the end, the first and the last.
Hearken unto me, O Jacob and Israel, my called; I am he; I am the first, I also am the last.
Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
Who hath wrought and done it, calling the generations from the beginning? I the LORD, the first, and with the last; I am he.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.