Revelation 9:9

Revised Standard Version (RSV-CI)

they had scales like iron breastplates, and the noise of their wings was like the noise of many chariots with horses rushing into battle.

Cross References

Job 39:25

When the trumpet sounds, he says ‘Aha!’ He smells the battle from afar, the thunder of the captains, and the shouting.

Job 40:18

His bones are tubes of bronze, his limbs like bars of iron.

Isaiah 9:5

For every boot of the tramping warrior in battle tumult and every garment rolled in blood will be burned as fuel for the fire.

Jeremiah 47:3

At the noise of the stamping of the hoofs of his stallions, at the rushing of his chariots, at the rumbling of their wheels, the fathers look not back to their children, so feeble are their hands,

Revelation 9:17

And this was how I saw the horses in my vision: the riders wore breastplates the color of fire and of sapphire and of sulphur, and the heads of the horses were like lions' heads, and fire and smoke and sulphur issued from their mouths.