Revelation 9:13-19

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. 17The horses and riders I saw in my vision looked like this: Their breastplates were fiery red, dark blue, and yellow as sulfur. The heads of the horses resembled the heads of lions, and out of their mouths came fire, smoke and sulfur. 18A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their mouths.

19The power of the horses was in their mouths and in their tails; for their tails were like snakes, having heads with which they inflict injury.