Revelation 16:12 in the King James Version
And the sixth angel poured out his vial upon the great river Euphrates; and the water thereof was dried up, that the way of the kings of the east might be prepared.
Context
11 and they blasphemed the God of heaven because of their pains and their sores. They still didn’t repent of their works.
12 The sixth poured out his bowl on the great river, the Euphrates. Its water was dried up, that the way might be prepared for the kings that come from the sunrise.
13 I saw coming 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, something like frogs;