Revelation 9:14
saying to the sixth angel, who had the trumpet: Loose the four angels that are bound at the great river Euphrates.
Revelation 16:12
And the sixth angel poured out his cup on the great river Euphrates; and its water was dried up, that the way of the kings of 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 the wind might not blow on the earth, nor on the sea, nor on any tree.
Revelation 8:2
And I saw the seven angels that stood before God, and seven trumpets were given to them.
Revelation 8:6
And the seven angels that had the seven trumpets prepared themselves to sound.
Revelation 9:15
And the four angels were loosed, who were prepared for an hour, and a day, and a month, and a year, to slay the third part of men.