Revelation 9:14
say to the sixth angel who had the trumpet: "Turn loose the four angels that are bound at the river Euphrates."
Revelation 16:12
Then the sixth angel emptied his bowl upon the great river Euphrates, and its waters were dried up to prepare the way for the kings from the east.
Revelation 7:1
After this I saw four angels standing at the four corners of the earth holding back the four winds of the earth, so that no wind should blow on the earth, the sea, or any tree.
Revelation 8:2
Then I saw the seven angels who stand before God, and seven trumpets were given to them.
Revelation 8:6
And the seven angels with the seven trumpets prepared to blow them.
Revelation 9:15
Then the four angels that were kept in readiness for that hour and day and month and year were turned loose to kill one-third of mankind.