Exodus 39:21-23

World English Bible

²¹ They 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 Yahweh commanded Moses.

²² He made the robe of the ephod of woven work, all of blue. ²³ The opening of the robe in the middle of it was like the opening of a coat of mail, with a binding around its opening, that it should not be torn.