Revelation 9:9

They had breastplates (scales) like breastplates made of iron; and the [whirring] noise of their wings was like the [thunderous] noise of countless horse-drawn chariots charging [at full speed] into battle.

Job 39:25


“As often as the trumpet sounds he says, ‘Aha!’
And he smells the battle from far away,
And senses the thunder of the captains and the war cry.

Job 40:18


“His bones are tubes of bronze;
His limbs are like bars of iron.

Job 41:23-30


“The folds of his flesh are joined together,
Firm on him and immobile [when he moves].

Isaiah 9:5


For every boot of the marching warrior in the battle tumult,
And [every soldier’s] garment rolled in blood, will be used for burning, fuel for the fire.

Joel 2:5-8


Like the noise of chariots
They leap on the tops of the mountains,
Like the crackling of a flame of fire devouring the stubble,
Like a mighty people set in battle formation.

Nahum 2:4-5


The chariots race madly in the streets;
They rush wildly in the broad plazas.
Their appearance is like torches;
They rush in various directions like forked lightning.

Revelation 9:17

And this is how I saw the horses and their riders in my vision: the riders had breastplates [the color] of fire and of hyacinth (sapphire blue) and of brimstone (yellow); and the heads of the horses looked like the heads of lions; and from out of their mouths came fire and smoke and brimstone (burning sulfur).

Treasury of Scripture Knowledge

Summary

And they had breastplates, as it were breastplates of iron; and the sound of their wings was as the sound of chariots of many horses running to battle.

Bible References

They had

Revelation 9:17
And this is how I saw the horses and their riders in my vision: the riders had breastplates [the color] of fire and of hyacinth (sapphire blue) and of brimstone (yellow); and the heads of the horses looked like the heads of lions; and from out of their mouths came fire and smoke and brimstone (burning sulfur).
Job 40:18

“His bones are tubes of bronze;
His limbs are like bars of iron.
Job 41:23

“The folds of his flesh are joined together,
Firm on him and immobile [when he moves].
Joel 2:8

They do not crowd each other;
Each one marches in his path.
When they burst through the defenses (weapons),
They do not break ranks.

And the

Job 39:25

“As often as the trumpet sounds he says, ‘Aha!’
And he smells the battle from far away,
And senses the thunder of the captains and the war cry.
Isaiah 9:5

For every boot of the marching warrior in the battle tumult,
And [every soldier’s] garment rolled in blood, will be used for burning, fuel for the fire.
Joel 2:5

Like the noise of chariots
They leap on the tops of the mountains,
Like the crackling of a flame of fire devouring the stubble,
Like a mighty people set in battle formation.
Nahum 2:4

The chariots race madly in the streets;
They rush wildly in the broad plazas.
Their appearance is like torches;
They rush in various directions like forked lightning.