Exodus 39:21-23

Revised Standard Version

²¹ And they bound the breastpiece by its rings to the rings of the ephod with a lace of blue, so that it should lie upon the skilfully woven 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; ²³ and the opening of the robe in it was like the opening in a garment, with a binding around the opening, that it might not be torn.