Revelation 9:9

They had breastplates like breastplates of iron, and the sound of their wings was like the thundering of many horses and chariots rushing into battle.

Treasury of Scripture Knowledge

Summary

And a certain man drew a bow at a venture, and smote the king of Israel between the joints of the harness: wherefore he said unto the driver of his chariot, Turn thine hand, and carry me out of the host; for I am wounded.

Joints of the harness

Bible References

Joints of the harness

Revelation 9:9
They had breastplates like breastplates of iron, and the sound of their wings was like the thundering of many horses and chariots rushing into battle.