Exodus 28:29-31

Revised Standard Version

²⁹ So Aaron shall bear the names of the sons of Israel in the breastpiece of judgment upon his heart, when he goes into the holy place, to bring them to continual remembrance before the Lord. ³⁰ And in the breastpiece of judgment you shall put the Urim and the Thummim, and they shall be upon Aaron’s heart, when he goes in before the Lord; thus Aaron shall bear the judgment of the people of Israel upon his heart before the Lord continually.

Other Priestly Vestments

³¹ “And you shall make the robe of the ephod all of blue.