Revelation 9:15-17

Young's Literal Translation

¹⁵ and loosed were the four messengers, who have been made ready for the hour, and day, and month, and year, that they may kill the third of men;

¹⁶ and the number of the forces of the horsemen [is] two myriads of myriads, and I heard the number of them.

¹⁷ And thus I saw the horses in the vision, and those sitting upon them, having breastplates of fire, and jacinth, and brimstone; and the heads of the horses [are] as heads of lions, and out of their mouths proceedeth fire, and smoke, and brimstone;