Revelation 9:17-18
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17And this is how I saw in my vision the horses and those who sat on them: the riders had breastplates the color of fire, of hyacinth, and of brimstone; and the heads of the horses are like the heads of lions; and out of their mouths *came fire and smoke and brimstone. 18A third of mankind was killed by these three plagues, by the fire, the smoke, and the brimstone which came out of their mouths.