Revelation 9:16

13 And the sixth messenger did sound, and I heard a voice out of the four horns of the altar of gold that is before God,

14 saying to the sixth messenger who had the trumpet, `Loose the four messengers who are bound at the great river Euphrates;`

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;

18 by these three were the third of men killed, from the fire, and from the smoke, and from the brimstone, that is proceeding out of their mouth,

19 for their authorities are in their mouth, and in their tails, for their tails [are] like serpents, having heads, and with them they do injure;