Revelation 9:15-18

And the four angels, who had been prepared for the hour and day and month and year, were released, so that they would kill a third of mankind. The number of the armies of the horsemen was two hundred million; I heard the number of them. And this is how I saw in the vision the horses and those who sat on them: the riders had breastplates the color of fire and of hyacinth and of brimstone; and the heads of the horses are like the heads of lions; and out of their mouths proceed fire and smoke and brimstone. A third of mankind was killed by these three plagues, by the fire and the smoke and the brimstone which proceeded out of their mouths.