John the Apostle
Revelation 19:5ESV·traditional attribution

And from the throne came a voice saying, “Praise our God, all you his servants, you who fear him, small and great.”

Matthew Henry Presbyterian @wholebiblehenry

The triumphant song being ended, and epithalamium, or marriage-song, begins, Rev 19:6. Here observe, I. The concert of heavenly music. The chorus was large and loud, as the voice of many waters and of mighty thunderings. God is fearful in praises. There is no discord in heaven; the morning stars sing together; no jarring string, nor key untuned, but pure and perfect melody. II.

Commenting on Revelation 19:5-10

John Gill Reformed Baptist @doctorgill

And a voice came out of the throne,.... Not from God the Father, that sat upon it, for the phrase, praise our God, could not be said by him with propriety and pertinence; but rather from Christ, the Lamb, in the midst of the throne, who as Mediator could say of him to his people, my God and your God, and my Father and your...

Albert Barnes Presbyterian @notesbybarnes

Verse 5. And a voice came out of the throne. A voice seemed to come from the very midst of the throne. It is not said by whom this voice was uttered. It cannot be supposed, however, that it was uttered by God himself, for the command which it gave was this: "Praise our God," etc.