Leviticus 21:3-5

New Century Version

³ unmarried sister who is close to him because she has no husband. The priest may make himself unclean for her if she dies. ⁴ But a priest must not make himself unclean if the dead person was only related to him by marriage.

⁵ “‘Priests must not shave their heads, or shave off the edges of their beards, or cut their bodies.