Revelation 9:17

And this was the appearance of the horses which I saw in my vision--and of their riders. The body-armour of the riders was red, blue and yellow; and the horses' heads were shaped like the heads of lions, while from their mouths there came fire and smoke and sulphur.

Revelation 9:18

By these three plagues a third part of mankind were destroyed--by the fire and the smoke, and by the sulphur which came from their mouths.

Revelation 14:10

he shall drink the wine of God's anger which stands ready, undiluted, in the cup of His fury, and he shall be tormented with fire and sulphur in the presence of the holy angels and of the Lamb.

Revelation 19:20

who had done the miracles in his presence with which he had led astray those who had received the mark of the Wild Beast, and those who worshipped his statue. Both of them were thrown alive into the Lake of fire that was all ablaze with sulphur.

Revelation 21:8

But as for cowards and the unfaithful, and the polluted, and murderers, fornicators, and those who practise magic or worship idols, and all liars--the portion allotted to them shall be in the Lake which burns with fire and sulphur. This is the Second Death."

Revelation 9:9

They had breast-plates which seemed to be made of steel; and the noise caused by their wings was like that of a vast number of horses and chariots hurrying into battle.

Revelation 11:5

And if any one seeks to injure them--fire comes from their mouths and devours their enemies; and if any one seeks to injure them, he will in this way certainly be killed.

Revelation 20:10

and the Devil, who had been leading them astray, was thrown into the Lake of fire and sulphur where the Wild Beast and the false Prophet were, and day and night they will suffer torture until the Ages of the Ages.

Revelation 21:20

the seventh chrysolite, the eighth beryl, the ninth topaz, the tenth chrysoprase, the eleventh jacinth, the twelfth amethyst.

Treasury of Scripture Knowledge

Summary

And thus I saw the horses in the vision, and them that sat on them, having breastplates of fire, and of jacinth, and brimstone: and the heads of the horses were as the heads of lions; and out of their mouths issued fire and smoke and brimstone.

Bible References

Having

Revelation 9:9
They had breast-plates which seemed to be made of steel; and the noise caused by their wings was like that of a vast number of horses and chariots hurrying into battle.

Jacinth

Revelation 21:20
the seventh chrysolite, the eighth beryl, the ninth topaz, the tenth chrysoprase, the eleventh jacinth, the twelfth amethyst.

Brimstone

Revelation 9:18
By these three plagues a third part of mankind were destroyed--by the fire and the smoke, and by the sulphur which came from their mouths.
Revelation 14:10
he shall drink the wine of God's anger which stands ready, undiluted, in the cup of His fury, and he shall be tormented with fire and sulphur in the presence of the holy angels and of the Lamb.
Revelation 19:20
who had done the miracles in his presence with which he had led astray those who had received the mark of the Wild Beast, and those who worshipped his statue. Both of them were thrown alive into the Lake of fire that was all ablaze with sulphur.
Revelation 21:8
But as for cowards and the unfaithful, and the polluted, and murderers, fornicators, and those who practise magic or worship idols, and all liars--the portion allotted to them shall be in the Lake which burns with fire and sulphur. This is the Second Death."