Revelation 9:13-18

The sixth angel blew his trumpet. From the four horns of the golden altar that is before God, I 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. The number of mounted troops was two hundred million; I heard their number. This is how I saw the horses and their riders in the vision: They had breastplates that were fiery red, hyacinth blue, and sulfur yellow. The heads of the horses were like the heads of lions, and from their mouths came fire, smoke, and sulfur. A third of the human race was killed by these three plagues — by the fire, the smoke, and the sulfur that came from their mouths.