Exodus 39:29-31 Holman Christian Standard Bible (HCSB)
29 and the sash of finely spun linen of embroidered blue, purple, and scarlet yarn. They did just as the Lord had commanded Moses.
Making the Holy Diadem
30 They also made a medallion, the holy diadem, out of pure gold and wrote on it an inscription like the engraving on a seal:
HOLY TO THE LORD.
31 Then they attached a cord of blue yarn to it in order to mount it on the turban, just as the Lord had commanded Moses.