Exodus 28:37 in the King James Version
And thou shalt put it on a blue lace, that it may be upon the mitre; upon the forefront of the mitre it shall be.
Context
36 “You shall make a plate of pure gold, and engrave on it, like the engravings of a signet, ‘HOLY TO THE LORD.’
37 You shall put it on a lace of blue, and it shall be on the sash. It shall be on the front of the sash.
38 It shall be on Aaron’s forehead, and Aaron shall bear the iniquity of the holy things, which the children of Israel shall make holy in all their holy gifts; and it shall be always on his forehead, that they may be accepted before the LORD.