Revelation 9:14

9:14 saying to the sixth angel, the one holding the trumpet, “Set free the four angels who are bound at the great river Euphrates!”

Revelation 11:14

11:14 The second woe has come and gone; the third is coming quickly.

Isaiah 8:7

8:7 So look, the sovereign master is bringing up against them the turbulent and mighty waters of the Euphrates River – the king of Assyria and all his majestic power. It will reach flood stage and overflow its banks.