Revelation 16:13-16

And I saw out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, as frogs; for they are the spirits of demons, doing signs; which go out to the kings of the whole habitable world to gather them together to the war of that great day of God the Almighty. (Behold, I come as a thief. Blessed is he that watches and keeps his garments, that he may not walk naked, and that they may not see his shame.) And he gathered them together to the place called in Hebrew, Armagedon.