'Breastplate' in the Bible

He set the breastplate on him, placed the Urim and Thummim on top of the breastplate,

He put on righteousness like a breastplate, and a helmet of salvation on his head; he put on garments of vengeance for clothing, and wrapped himself in fury like a cloak.

Stand firm, therefore, having fastened the belt of truth around your waist, and having put on the breastplate of righteousness,

But since we belong to the day, let's be sober. We must put on the breastplate of faith and love, and the hope of salvation as a helmet.