Exodus 39:21-23

New English Translation

²¹ They tied the breastpiece by its rings to the rings of the ephod by blue cord, so that it was above the waistband of the ephod, so that the breastpiece would not be loose from the ephod, just as the Lord had commanded Moses.

The Other Garments

²² He made the robe of the ephod completely blue, the work of a weaver. ²³ There was an opening in the center of the robe, like the opening of a collar,^[a] with an edge all around the opening so that it could not be torn.