Exodus 39:19

17They put the two braided chains of gold in the two rings at the ends of the breastplate.

18The other two ends of the two braided chains they put on the two settings, and put them on the shoulder straps of the ephod, in its front.

19They made two rings of gold, and put them on the two ends of the breastplate, on its edge, which was toward the side of the ephod inward.

20They made two more rings of gold, and put them on the two shoulder straps of the ephod underneath, in its front, close by its coupling, above the skillfully woven band of the ephod.

21They bound the breastplate by its rings to the rings of the ephod with a lace of blue, that it might be on the skillfully woven band of the ephod, and that the breastplate might not come loose from the ephod, as the LORD commanded Moses.