Exodus 28:30
And you shall put in the breastplate of judgment the Urim and the Thummim; and they shall be on Aaron's heart, when he goes in before the LORD: and Aaron shall bear the judgment of the children of Israel on his heart before the LORD continually.
Torrey's Topical Textbook—AKJV

Leviticus 8:8
And he put the breastplate on him: also he put in the breastplate the Urim and the Thummim.
Torrey's Topical Textbook—AKJV