Revelation 9:14
saying to the sixth angel who held the trumpet, Loose the four angels which are bound at the great river Euphrates.
Revelation 16:12
And the sixth angel poured out his vase upon the great river Euphrates; and the water thereof was dried up, that the way of the kings who come from the rising of the sun might be prepared.
Revelation 7:1
AND after these things I saw four angels standing at the four corners of the earth, to hold back the four winds of the earth, that the wind should not blow on the earth, neither on the sea, nor on any tree.
Revelation 8:2
And I saw the seven angels which stood before God, and there were given to them seven trumpets.
Revelation 8:6
And the seven angels holding the seven trumpets prepared themselves to sound.
Revelation 9:15
And the four angels were loosed, who were ready at the hour, and day, and month, and year, to kill the third part of mankind.