Exodus 39:21-23

English 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 on the skillfully woven band of the ephod, and that the breastpiece should not come loose from the ephod, as the Lord had commanded Moses.

^22 (A)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, so that it might not tear.