Exodus 39:20-22

King James Version

²⁰ And they made two other golden rings, and put them on the two sides of the ephod underneath, toward the forepart of it, over against the other coupling thereof, above the curious girdle of the ephod.

²¹ And they did bind the breastplate by his rings unto the rings of the ephod with a lace of blue, that it might be above the curious girdle of the ephod, and that the breastplate might not be loosed from the ephod; as the Lord commanded Moses.

²² And he made the robe of the ephod of woven work, all of blue.