John the Apostle
Revelation 1:11ASV·traditional attribution

saying, What thou seest, write in a book and send it to the seven churches: unto Ephesus, and unto Smyrna, and unto Pergamum, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea.

Jamieson-Fausset-Brown Reformed

I am Alpha and Omega, the first and the last; and--The oldest manuscripts, omit all this clause. write in a book--To this book, having such an origin, and to the other books of Holy Scripture, who is there that gives the weight which their importance demands, preferring them to the many books of the world? [BENGEL].

Matthew Henry Presbyterian

We have now come to that glorious vision which the apostle had of the Lord Jesus Christ, when he came to deliver this revelation to him, where observe, I. The account given of the person who was favoured with this vision. He describes himself, 1. By his present state and condition. He was the brother and companion of these churches in tribulation, and in the kingdom and patience of Christ.

Commenting on Revelation 1:9-20

John Gill Reformed Baptist

Saying, I am Alpha and Omega, the first and the last,.... These characters, which are repeated here; see Gill on Rev 1:8; are left out in the Alexandrian copy, the Complutensian edition, the Vulgate Latin, Syriac, and Ethiopic versions; but are very fitly retained, to point out the person that speaks; to express his dignity, deity, and eternity; to excite the attention of John, and...