Exodus 39:21-23

New Revised Standard Version Catholic Edition

²¹ They bound the breastpiece by its rings to the rings of the ephod with a blue cord, so that it should lie on the decorated band of the ephod, and that the breastpiece should not come loose from the ephod; as the Lord had commanded Moses.

²² He also made the robe of the ephod woven all of blue yarn; ²³ and the opening of the robe in the middle of it was like the opening in a coat of mail,^[a] with a binding around the opening, so that it might not be torn.