Revelation 9:13 And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,

9:14 Saying to the sixth angel which had the trumpet, Loose the four angels which are bound in the great river Euphrates.

9:15 And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.