Exodus 39:20-22

Legacy Standard Bible

²⁰ Furthermore, they made two gold rings and placed them on the bottom of the two shoulder pieces of the ephod, on the front of it, close to the place where it joined, above the skillfully woven band of the ephod. ²¹ They bound the breastpiece by its rings to the rings of the ephod with a blue cord, so that it would be on the skillfully woven band of the ephod, and that the breastpiece would not come loose from the ephod, just as Yahweh had commanded Moses.

^22 (A)Then he made the robe of the ephod of woven work entirely of blue;