Revelation 9:13-16

13The sixth angel sounded his trumpet, and I heard a voice coming from the four horns of the golden altar that is before God.

14It said to the sixth angel who had the trumpet, “Release the four angels who are bound at the great river Euphrates.”

15And the four angels who had been kept ready for this very hour and day and month and year were released to kill a third of mankind.

16The number of the mounted troops was twice ten thousand times ten thousand. I heard their number.