NET

21 They tied the breastpiece by its rings to the rings of the ephod by blue cord, so that it was above the waistband of the ephod, so that the breastpiece would not be loose from the ephod, just as the Lord had commanded Moses.

Darby

21 And they bound the breastplate with its rings to the rings of the ephod with lace of blue, that it might be above the girdle of the ephod, and that the breastplate might not be loosed from the ephod; as Jehovah had commanded Moses.

KJV

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.