John the Apostle
Revelation 1:3ESV·traditional attribution

Blessed is the one who reads aloud the words of this prophecy, and blessed are those who hear, and who keep what is written in it, for the time is near.

Matthew Henry Presbyterian @wholebiblehenry

We have here an apostolic benediction on those who should give a due regard to this divine revelation; and this benediction is given more generally and more especially. I. More generally, to all who either read or hear the words of the prophecy.

Commenting on Revelation 1:3-8

John Gill Reformed Baptist @doctorgill

Blessed is he that readeth,.... This book the Revelation, privately, in his closet or family, carefully and diligently, with a desire of understanding it; or publicly in the church of God, and endeavours open and explain it to others; and may allude to the reading of the law and the prophets in the synagogues, which were not barely read, but expounded; see Act 13:15; and...

Albert Barnes Presbyterian @notesbybarnes

Verse 3. Blessed is he that readeth. That is, it is to be regarded as a privilege attended with many blessings, to be permitted to mark the disclosures to be made in this book; the important revelations respecting future times.