Exodus 28:36-38 - The Turban
36 Thou shalt also make an open flower of pure gold and engrave upon it the engravings of a seal, HOLINESS UNTO THE LORD.
37 And thou shalt put it on with a blue lace that it may be upon the mitre; upon the forefront of the mitre it shall be. 38 And it shall be upon Aaron's forehead that Aaron may bear the iniquity of the holy things, which the sons of Israel shall sanctify in all their holy gifts; and it shall be always upon his forehead that they may find grace before the LORD.