Leviticus 21:1-5

1And Jehovah said unto Moses, Speak unto the priests, the sons of Aaron, and say unto them, There shall none defile himself for the dead among his people;

2except for his kin, that is near unto him, for his mother, and for his father, and for his son, and for his daughter, and for his brother,

3and for his sister a virgin, that is near unto him, that hath had no husband; for her may he defile himself.

4He shall not defile himself, being a chief man among his people, to profane himself.

5They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.