Leviticus 21:4

1 The Lord said to Moses, "Speak to the priests, the sons of Aaron, and say to them, 'A priest shall not defile himself for the dead among his people;

2 except for his relatives that are near to him: for his mother, for his father, for his son, for his daughter, for his brother,

3 and for his virgin sister who is near to him, who has had no husband; for her he may defile himself.

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

5 "'They shall not shave their heads, neither shall they shave off the corners of their beards, nor make any cuttings in their flesh.

6 They shall be holy to their God, and not profane the name of their God; for they offer the offerings of the Lord made by fire, the bread of their God; therefore they shall be holy.

7 "'They shall not marry a woman who is a prostitute, or profane; neither shall they marry a woman divorced from her husband: for he is holy to his God.