Exodus 39:1-7

Moreover, from the blue and purple and scarlet fabric, they made finely woven garments for serving and ministering in the Holy Place; they made the holy garments for Aaron, just as the LORD had commanded Moses. Bezalel made the ephod of gold, and of blue, purple, and scarlet fabric, and fine twisted linen. Then Bezalel and Oholiab hammered the gold [into thin sheets] and cut it into threads to work into the blue, purple, and scarlet fabric, and into the fine linen, the work of a skilled craftsman. They made attaching shoulder pieces for the ephod; it was attached at its two [upper] edges. The skillfully woven sash with which to bind it, which was on the ephod [to hold it in place], was like its workmanship, of the same material: of gold and of blue, purple, and scarlet fabric, and fine twisted linen, just as the LORD had commanded Moses. They made the onyx stones, set in settings of gold filigree; they were engraved as signets are engraved, with the names of [the twelve tribes of] the sons of Israel. And he put them on the shoulder pieces of the ephod to be memorial stones (a remembrance) for the sons of Israel (Jacob), just as the LORD had commanded Moses.