Exodus 28:6; Exodus 28:30

6 “Make the ephod of gold, and of blue, purple and scarlet yarn, and of finely twisted linen—the work of skilled hands.

30 Also put the Urim and the Thummim in the breastpiece, so they may be over Aaron’s heart whenever he enters the presence of the LORD. Thus Aaron will always bear the means of making decisions for the Israelites over his heart before the LORD.