Exodus 28
27 You shall make two rings of gold, and shall put them on the two shoulder-pieces of the ephod underneath, in the forepart of it, close by the coupling of it, above the skillfully woven band of the ephod.
28 Ref They shall bind the breastplate by the rings of it to the rings of the ephod with a lace of blue, that it may be on the skillfully woven band of the ephod, and that the breastplate may not swing out from the ephod.