Leviticus 21:3-5

The Voice

³ and any sister who is still a virgin when she dies. Since she has no husband, the priest is her closest relative, so he is allowed to make himself impure for her. ⁴ A priest must not render himself impure and defile himself by touching the corpse of a person related to him only by marriage. ⁵ Priests are not allowed to mourn like other people by shaving their heads, trimming their beards, or cutting gashes into their bodies.