I am the Alpha and the Omega, the First and the Last, the Beginning and the End.”
We have here a solemn ratification of the contents of this book, and particularly of this last vision (though some think it may not only refer to the whole book, but to the whole New Testament, yea, to the whole Bible, completing and confirming the canon of scripture); and here, 1.
Commenting on Revelation 22:6-19
I am Alpha and Omega,.... See Gill on Rev 1:8. These characters are all put together here, which are before used in Rev 1:8 and are very pertinently mentioned in this place, when all promises and prophecies, relating to the glorious kingdom of Christ, were just finishing, and that itself was ready to appear, in which Christ alone should be exalted, the mystery of God...
Verse 13. I am Alpha and Omega, etc. . The idea here is, that he will thus show that he is the first and the and last --the beginning and the end. He originated the whole plan of salvation, he will determine its close; he formed the world, and he will wind up its affairs.