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Clothing for the Priests
36“Next make a medallion of pure gold, and engrave it like a seal with these words: Holy to the Lord. 37Attach the medallion with a blue cord to the front of Aaron’s turban, where it must remain. 38Aaron must wear it on his forehead so he may take on himself any guilt of the people of Israel when they consecrate their sacred offerings. He must always wear it on his forehead so the Lord will accept the people.
Exodus 28:36-38 (NLT)