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Garments of the Priests
36“You shall also make a plate of pure gold and engrave on it, like the engravings of a signet, ‘Holy to the Lord.’ 37You shall fasten it on a violet cord, and it shall be on the turban; it shall be at the front of the turban. 38It shall be on Aaron’s forehead, and Aaron shall take away the guilt of the holy things which the sons of Israel consecrate, regarding all their holy gifts; and it shall always be on his forehead, so that they may be accepted before the Lord.
Exodus 28:36-38 (NASB)