Exo28:28 So that the rings on the bag may be fixed to the rings of the ephod by a blue cord and on to the band of the ephod, so that the bag may not come loose from the ephod.
Exo39:21 And the rings on the bag were fixed to the rings of the ephod by a blue cord, keeping it in place over the band, so that the bag might not get loose, as the Lord gave orders to Moses.