Exodus 28:26-30

And you shall make two rings of gold and place them on the two ends of the breastpiece, on the edge of it, which is toward the inner side of the ephod.

And you shall make two rings of gold and put them on the bottom of the two shoulder pieces of the ephod, on the front of it close to the place where it is joined, above the skillfully woven band of the ephod.

And they shall bind the breastpiece by its rings to the rings of the ephod with a violet cord, so that it will be on the skillfully woven band of the ephod, and that the breastpiece will not come loose from the ephod.

So Aaron shall carry the names of the sons of Israel in the breastpiece of judgment over his heart when he enters the Holy Place, as a memorial before the Lord continually.

And you shall put in the breastpiece of judgment the Urim and the Thummim, and they shall be over Aaron’s heart when he goes in before the Lord; and Aaron shall carry the judgment of the sons of Israel over his heart before the Lord continually.