Exodus 28:29-30

29And Aaron shall bear the names of the children of Israel in the breastplate of judgment on his heart, when he goes in to the sanctuary, for a memorial before Jehovah continually.

30And thou shalt put into the breastplate of judgment the Urim and the Thummim, that they may be upon Aaron's heart when he goeth in before Jehovah; and Aaron shall bear the judgment of the children of Israel upon his heart before Jehovah continually.