In the breastpiece of judgment you shall put the Urim (Lights) and the Thummim (Perfections) [to be used for determining God’s will in a matter]. They shall be over Aaron’s heart whenever he goes before the Lord, and Aaron shall always carry the judgment (verdict, judicial decisions) of the sons of Israel over his heart before the Lord.

Moses then put the breastpiece on Aaron, and he put in the breastpiece the Urim and the Thummim [the sacred articles the high priest used when seeking God’s will concerning the nation].

Of Levi he said,

“Your Thummim and Your Urim belong to Your godly man [Aaron],
Whom You tested and proved at Massah,
With whom You contended at the waters of Meribah;

The governor told them that they should not eat of the most holy things [the priests’ food] until a priest stood up with Urim and Thummim [who by consulting these articles in his breastplate could determine God’s will in the matter].

The governor told them that they should not eat any of the most holy food until a priest arose with Urim and Thummim [to determine God’s will in the matter].