Revelation 9:17-19

American Standard Version

¹⁷ And thus I saw the horses in the vision, and them that sat on them, having breastplates as of fire and of hyacinth and of brimstone: and the heads of the horses are as the heads of lions; and out of their mouths proceedeth fire and smoke and brimstone. ¹⁸ By these three plagues was the third part of men killed, by the fire and the smoke and the brimstone, which proceeded out of their mouths. ¹⁹ For the power of the horses is in their mouth, and in their tails: for their tails are like unto serpents, and have heads; and with them they hurt.