Revelation 9:14
Saying to the sixth angel, who had the trumpet, Loose the four angels who are bound in the great river Euphrates.
Revelation 16:12
And the sixth poured out his phial upon the great river Euphrates, and the water of it 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, that the wind should not blow upon the earth, nor on the sea, nor on any tree.
Revelation 8:2
And I saw the seven angels which stand before God, and seven trumpets were given them.
Revelation 8:6
And the seven angels, who had the seven trumpets, prepared themselves to sound.
Revelation 9:15
And the four angels were loosed, who were prepared for the hour, and day, and month, and year, to kill the third part of men.