John the Apostle
Revelation 12:7BSB·traditional attribution

Then a war broke out in heaven: Michael and his angels fought against the dragon, and the dragon and his angels fought back.

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 there was war in heaven,.... Not in the third heaven, the habitation of God, the seat of the angels and glorified saints, there is no discord, jars, and contentions there, nothing but peace, love, and joy; but in the church below, which is militant, and has in it as it were a company of two armies; or rather in the Roman empire, which was...

Albert Barnes Presbyterian @notesbybarnes

Verse 7. And there was war in heaven. There was a state of things existing in regard to the woman and the child--the church in the condition in which it would then be--which would be well represented by a war in heaven; that is, by a conflict between the powers of good and evil, of light and darkness.