And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron's heart, when he goeth in before the Lord: and Aaron shall bear the judgment of the children of Israel upon his heart before the Lord continually. (28:30)

--Leviticus--

And he put the breastplate upon him: also he put in the breastplate the Urim and the Thummim. (8:8)