Then a war broke out in the sky: Michael and his angels fought against the dragon. The dragon fought together with his angels, but they did not prevail and there was no more room for them in heaven. The great dragon, the ancient serpent, the one we call the devil and satan and who seduces the whole earth, was plunged to the earth and with him his angels were also precipitated.

Apocalypse of St. John 12, 7