The Urim and Thummim

Exodus 28:30, “And in the breastpiece of judgment you shall put the Urim and the Thummim, and they shall be on Aaron’s heart, when he goes in before the Lord. Thus Aaron shall bear the judgment of the people of Israel on his heart before the Lord regularly.” ESV

“Urim and Thummim – They were used by the priests to receive divine messages and were kept in the high priest’s breastplate…Quite possibly the lack of description of the Urim and Thummim was deliberate, in order to prevent copies from being made.” ESV Hebrew-Greek Key Word Study Bible