Revelation 9:17-19

17And 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. 18By 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. 19For 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.