'Armor' in the Bible

But when someone stronger than he attacks him and overpowers him, he takes away from him all his armor on which he had relied and distributes his plunder.

The night is almost gone, and the day is near. Therefore let us lay aside the deeds of darkness and put on the armor of light.

Put on the full armor of God, so that you will be able to stand firm against the schemes of the devil.

Therefore, take up the full armor of God, so that you will be able to resist in the evil day, and having done everything, to stand firm.