Exodus 28:30

28:30 “You are to put the Urim and the Thummim into the breastpiece of decision; and they are to be over Aaron’s heart when he goes in before the Lord. Aaron is to bear the decisions of the Israelites over his heart before the Lord continually.

Ezra 2:63

2:63 The governor instructed them not to eat any of the sacred food until there was a priest who could consult the Urim and Thummim.