Exodus 28:30

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.

And Aaron shall bear the names of the children of Israel in the breastplate of judgment upon his heart, when he goeth in unto the holy [place], for a memorial before the LORD continually.

And thou shalt make the robe of the ephod all [of] blue.

And there shall be an hole in the top of it, in the midst thereof: it shall have a binding of woven work round about the hole of it, as it were the hole of an habergeon, that it be not rent.