John the Apostle
Revelation 12:10ESV·traditional attribution

And I heard a loud voice in heaven, saying, “Now the salvation and the power and the kingdom of our God and the authority of his Christ have come, for the accuser of our brothers has been thrown down, who accuses them day and night before our God.

Matthew Henry Presbyterian @wholebiblehenry

Here we see that early prophecy eminently fulfilled in which God said he would put enmity between the seed of the woman and the seed of the serpent, Gen 3:15. You will observe, I. The attempts of Satan and his agents to prevent the increase of the church, by devouring her offspring as soon as it was born; of this we have a very lively...

Commenting on Revelation 12:1-11

John Gill Reformed Baptist @doctorgill

And I heard a loud voice saying in heaven,.... Which was a song of praise on account of the victory obtained by Michael and his angels over the dragon and his, or for the overthrow and downfall of Paganism in the Roman empire; for by "heaven" is meant the empire, now become Christian, or the Christian church state in it; and the "loud voice" heard...

Albert Barnes Presbyterian @notesbybarnes

Verse 10. And I heard a loud voice saying in heaven. The great enemy was expelled; the cause of God and truth was triumphant; and the conquering hosts united in celebrating the victor. This representation of a song, consequent on victory, is in accordance with the visual representations in the Bible.