Leviticus 21:10-12

“The high priest, the one among his brothers who has received the anointing oil poured on his head and been ordained to wear the priestly vestments, must not let his hair go wild and tangled nor wear ragged and torn clothes. He must not enter a room where there is a dead body. He must not ritually contaminate himself, even for his father or mother; and he must neither abandon nor desecrate the Sanctuary of his God because of the dedication of the anointing oil which is upon him. I am GOD.