Revelation 9:9

Christian Standard Bible Anglicised

they had chests like iron breastplates; the sound of their wings was like the sound of many chariots with horses rushing into battle;

Cross References

Revelation 9:17

This is how I saw the horses and their riders in the vision: They had breastplates that were fiery red, hyacinth blue, and sulphur yellow. The heads of the horses were like the heads of lions, and from their mouths came fire, smoke, and sulphur.

Job 40:18

His bones are bronze tubes; his limbs are like iron rods.

Job 39:25

When the ram’s horn blasts, he snorts defiantly. He smells the battle from a distance; he hears the officers’ shouts and the battle cry.

Isaiah 9:5

For every trampling boot of battle and the bloodied garments of war will be burned as fuel for the fire.

Jeremiah 47:3

At the sound of the stamping hooves of his stallions, the rumbling of his chariots, and the clatter of their wheels, fathers will not turn back for their sons. They will be utterly helpless