¹⁷ Thus I saw the horses in the vision: Those who sat on them had breastplates of fiery red, hyacinth blue, and sulfur yellow. The heads of the horses were like the heads of lions, and out of their mouths came fire and smoke and brimstone. ¹⁸ A third of mankind was killed by these three plagues—by the fire and by the smoke and by the brimstone, which came out of their mouths. ¹⁹ The power of the horses is in their mouths and in their tails. For their tails are like serpents, with heads by which they inflict injury.