The Book of Revelation 9

In Revelation 9, the fifth Angel blew his trumpet and swarms of demonic, locust-like creatures came out of the smoke on to the earth, and power was given to them. The sixth Angel blew his trumpet, John heard a voice say to the sixth angel who had the trumpet, “Release the four angels bound at the great river Euphrates.” So the four angels who were prepared for the hour, day, month, and year were released to kill a third of the human race.