Revelation 9:14
saying to the sixth angel who had the trumpet, Loose the four angels who are bound at the great river Euphrates.
Revelation 16:12
And the sixth poured out his vial upon the great river, the Euphrates; and the water thereof was dried up, that the way of the kings who are from the rising of the sun 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 should 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 to them seven trumpets.
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 in readiness for the hour, and day, and month, and year, to slay the third part of men.