Leviticus 21:3-5

Common English Bible

³ also for your unmarried sister, who is close to you because she isn’t married—you may be polluted for her sake. ⁴ You must not make yourself unclean for in-laws, defiling yourself by doing so.

⁵ Priests must not shave bald patches on their heads or cut off the ends of their beards or make gashes in their bodies.