Leviticus 21:3-7

³or his unmarried sister since she is a close relative because she doesn't have a husband.

⁴He must not make himself unclean for those only related to him by marriage—he is not to make himself ceremonially impure.

⁵Priests are not to shave bald spots on their heads, trim the sides of their beards, or cut their bodies.

⁶They must be holy to their God and not disgrace their God's reputation. They are the one who present the food offerings to the Lord, the food of their God. Consequently they must be holy.

⁷A priest is not to marry a woman made unclean through prostitution or who is divorced by her husband, for the priest must be holy to his God.