A third of humanity was killed by these three plagues, by the fire, the smoke, and the sulfur that came out of their mouths.
In context
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. 18A third of humanity was killed by these three plagues, by the fire, the smoke, and the sulfur that came out of their mouths. 19For the power of the horses is in their mouths and in their tails; for their tails are like serpents, having heads, and with them they inflict harm. 20The rest of humanity, those not killed by these plagues, did not repent of the works of their hands. They did not stop worshiping demons, and idols of gold, silver, bronze, stone, and wood, which cannot see or hear or walk.
