So the four angels who had been kept ready for this hour and day and month and year were released, to kill a third of humanity.
In context
13The sixth angel sounded his trumpet, and I heard a single voice coming from the horns of the golden altar that is before God, 14saying to the sixth angel who held the trumpet, “Release the four angels who are bound at the great river Euphrates.” 15So the four angels who had been kept ready for this hour and day and month and year were released, to kill a third of humanity. 16The number of the mounted troops was two hundred million; I heard their number. 17And this is how I saw the horses in my vision and their riders: they had breastplates the color of fire and of hyacinth and of sulfur. The heads of the horses were like the heads of lions, and out of their mouths came fire, smoke, and sulfur.
