The curious girdle of the ephod - The band for fastening it (see Exodus 28:8 note).

And they shall bind the breastplate by the rings thereof,.... By the rings at the lower ends of it, as it was by the rings at the upper ends of it to the shoulder pieces of the ephod; or "lift it up", so some interpret it (w) as if it was said, they shall lift up the breastplate to join it with the ephod that is above it:

unto the rings of the ephod with a lace of blue; this blue lace was put both into the rings of the breastplate and into the rings of the ephod, and so being tied in a knot, fastened them together, as the shoulder pieces of the ephod and the breastplate were coupled above, with wreathen chains of gold put into rings: now this was done:

that it may be above the curious girdle of the ephod: that the breastplate might be above it, or else the lace of blue:

and that the breastplate be not loosed from the ephod: but be kept tight and close to it by the wreathen chains above, and by the knots of blue lace below; which may denote the conjunction of the prophetic and priestly offices in Christ; the former being signified by the breastplate of judgment, in which the Urim and Thummim were, and the latter by the ephod; or else the union of the saints to Christ, the bond of which is everlasting love, from which there can be no separation; this union can never be dissolved, his people can never be loosed from him, they are members of his body, and one spirit with him.

(w) R. Sol. Urbin. Ohel Moed, fol. 89. 2.

And they shall bind the breastplate by the rings thereof unto the rings of the ephod with a lace of blue, that it may be above the curious girdle of the ephod, and that the breastplate be not loosed from the ephod.

28:15-30 The chief ornament of the high priest, was the breastplate, a rich piece of cloth, curiously worked. The name of each tribe was graven in a precious stone, fixed in the breastplate, to signify how precious, in God's sight, believers are, and how honourable. How small and poor soever the tribe was, it was as a precious stone in the breastplate of the high priest; thus are all the saints dear to Christ, however men esteem them. The high priest had the names of the tribes, both on his shoulders and on his breast, which reminds us of the power and the love with which our Lord Jesus pleads for those that are his. He not only bears them up in his arms with almighty strength, but he carries them in his bosom with tender affection. What comfort is this to us in all our addresses to God! The Urim and Thummim, by which the will of God was made known in doubtful cases, were put in this breastplate. Urim and Thummim signify light and integrity. There are many conjectures what these were; the most probable opinion seems to be, that they were the twelve precious stones in the high priest's breastplate. Now, Christ is our Oracle. By him God, in these last days, makes known himself and his mind to us, Heb 1:1,2; Joh 1:18. He is the true Light, the faithful Witness, the Truth itself, and from him we receive the Spirit of Truth, who leads into all truth.