Exodus 28:28-32

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.

“You shall make the robe of the ephod all of violet.

There shall be an opening at its top in the middle of it; around its opening there shall be a binding of woven work, like the opening of a coat of mail, so that it will not be torn.