Urim and Thummim: Placed in the Breastplate of the High Priest
Source: TTT
Exodus 28:30
And place the Urim and Thummim in the breastpiece of judgment, so that they will also be over Aaron’s heart whenever he comes before the LORD. Aaron will continually carry the judgment of the sons of Israel over his heart before the LORD.
Leviticus 8:8
Then he put the breastpiece on him and placed the Urim and Thummim in the breastpiece.