Revelation 12:7-10

Then a terrible war broke out in heaven. Michael and his angels fought against the great dragon. The dragon and his angels fought back. But the dragon did not have the power to win and they could not regain their place in heaven. So the great dragon was thrown down once and for all. He was the serpent, the ancient snake called the devil, and Satan, who deceives the whole earth. He was cast down into the earth and his angels along with him. Then I heard a triumphant voice in heaven proclaiming