Exodus 28:27-28

27And two other rings of gold thou shalt make, and shalt put them on the two sides of the ephod underneath, toward the forepart of it, opposite its other coupling, above the beautifully woven band of the ephod. 28And they shall bind the breastplate by its rings to the rings of the ephod with a lace of blue, that it may be above the beautifully woven band of the ephod, and that the breastplate be not loosed from the ephod.