Revelation 9:17-19

Darby Translation

¹⁷ And thus I saw the horses in the vision, and those that sat upon them, having breastplates of fire and jacinth and brimstone; and the heads of the horses [were] as heads of lions, and out of their mouths goes out fire and smoke and brimstone.

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

¹⁹ For the power of the horses is in their mouth and in their tails: for their tails [are] like serpents, having heads, and with them they injure.