Revelation 16:10-13

10The fifth angel poured out his bowl on the throne of the beast, and its kingdom was plunged into darkness. People gnawed their tongues in agony

11and cursed the God of heaven because of their pains and their sores, but they refused to repent of what they had done.

12The sixth angel poured out his bowl on the great river Euphrates, and its water was dried up to prepare the way for the kings from the East.

13Then I saw three impure spirits that looked like frogs; they came out of the mouth of the dragon, out of the mouth of the beast and out of the mouth of the false prophet.