Revelation 9:17-18

17And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.

18By these three was the third part of men killed, by the fire, and by the smoke, and by the brimstone, which issued out of their mouths.