The sixth angel poured his bowl on the great river Euphra’tes, and its water was dried up, to prepare the way for the kings from the east. And I saw, issuing from the mouth of the dragon and from the mouth of the beast and from the mouth of the false prophet, three foul spirits like frogs; for they are demonic spirits, performing signs, who go abroad to the kings of the whole world, to assemble them for battle on the great day of God the Almighty.
–Revelation 16:12-14