Revelation 9:14
saying to the sixth angel, who had the trumpet; "Loose the four angels that are bound in the great river Euphrates."
Revelation 16:12
And the sixth poured out his bowl upon the great river, the Euphrates; and its water was dried up, that the way of the kings who come from the rising of the sun might he prepared.
Revelation 7:1
After this I saw four angels standing at the four corners of the earth, holding the four winds of the earth, that no wind should blow on the earth, or on the sea, or upon 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 had been prepared for the hour, and day, and month, and year, that they might kill the third part of men.