Here are 2 Bible verses about the war in Heaven, curated from both the Old and New Testaments of the Holy Bible, King James Version, arranged from most to least relevant.
Revelation 12:7-11 KJV
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, 8 And prevailed not; neither was their place found any more in heaven. 9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him. …
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Revelation 12:9 KJV
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.