Revelation 9:14
saying to the sixth angel who had the trumpet, Unbind the four angels bound by the river, the great Euphrates.
Revelation 16:12
And the sixth poured out his bowl on the river, the great Euphrates; and its water was dried up, that the way of the kings from the East might be prepared.
Revelation 7:1
And after this I saw four angels standing on the four corners of the earth, holding the four winds of the earth, that no wind might blow on the earth, nor on the sea, nor on any tree.
Revelation 8:2
And I saw the seven angels who stand before God, and there were given them seven trumpets.
Revelation 8:6
And the seven angels having the seven trumpets prepared themselves to sound.
Revelation 9:15
And the four angels were unbound, who were prepared for the hour, and day, and month, and year, to kill a third part of men.