Leviticus 21
10 Ref And he who is the chief priest among his brothers, on whose head the holy oil has been put, who is marked out to put on the holy robes, may not let his hair go loose or have his clothing out of order as a sign of sorrow.
11 Ref He may not go near any dead body or make himself unclean for his father or his mother;
12 Ref He may not go out of the holy place or make the holy place of his God common; for the crown of the holy oil of his God is on him: I am the Lord.