Revelation 16:10-13

10Then the fifth angel poured out his bowl on the throne of the beast, and his kingdom was plunged into darkness. His subjects ground their teeth in anguish,

11and they cursed the God of heaven for their pains and sores. But they did not repent of their evil deeds and turn to God.

12Then the sixth angel poured out his bowl on the great Euphrates River, and it dried up so that the kings from the east could march their armies toward the west without hindrance.

13And I saw three evil spirits that looked like frogs leap from the mouths of the dragon, the beast, and the false prophet.