John the Apostle
Revelation 16:7BSB·traditional attribution

And I heard the altar reply: “Yes, Lord God Almighty, true and just are Your judgments.”

Matthew Henry Presbyterian @wholebiblehenry

We had in the foregoing chapter the great and solemn preparation that was made for the pouring out of the vials; now we have the performance of that work. Here observe, I. That, though every thing was made ready before, yet nothing was to be put in execution without an immediate positive order from God; and this he gave out of the temple, answering the...

Commenting on Revelation 16:1-7

John Gill Reformed Baptist @doctorgill

And the fourth angel poured out his vial upon the sun,.... Not literally; and so designs not a violent heat, which shall go before, and be a preparation for the burning of the world; nor any sore famine arising from it, which would be common to all, good and bad; but mystically: some understand this of Christ, the sun of righteousness, not of any wrath...

Albert Barnes Presbyterian @notesbybarnes

Verse 7. And I heard another. Evidently another angel, though this is not specified. Out of the altar. Either the angel of the altar--that is, who presided over the altar, (Prof. Stuart;) or an angel whose voice seemed to come from the altar. The sense is essentially the same.