Leviticus 21:4

New English Translation

He must not defile himself as a husband among his people so as to profane himself.

See the chapter Copy

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

Priests must not have a bald spot shaved on their head, they must not shave the corner of their beard, and they must not cut slashes in their body.