Exodus 28:29-30

Aaron shall carry the names of the sons of Israel in the breastpiece of judgment over his heart when he enters the holy place, for a memorial before the LORD continually. You shall put in the breastpiece of judgment the Urim and the Thummim, and they shall be over Aaron’s heart when he goes in before the LORD; and Aaron shall carry the judgment of the sons of Israel over his heart before the LORD continually.