Revelation 16:12-16

The sixth angel poured out his bowl on the great Euphrates River, and its water was dried up, to prepare the way for the kings from the East. Then I saw three unclean spirits like frogs coming out of the mouth of the dragon, out of the mouth of the beast, and out of the mouth of the false prophet. For they are spirits of demons, performing signs, who go out to the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty. “Look, I am coming as a thief. Blessed is he who watches and keeps his garments on, lest he walk naked and his shame be exposed.” They gathered them together to the place which in Hebrew is called Armageddon.