Revelation 16:14-17

for they are spirits of demons, performing signs, which go out to the kings of the whole world, to gather them together for the war of the great day of God, the Almighty. (“Behold, I am coming like a thief. Blessed is the one who stays awake and keeps his clothes, so that he will not walk about naked and men will not see his shame.”) And they gathered them together to the place which in Hebrew is called Har-Magedon. Then the seventh angel poured out his bowl upon the air, and a loud voice came out of the temple from the throne, saying, “It is done.”