Leviticus 21:3-5

Amplified Bible

³ also his virgin sister, who is near to him because she has had no husband; for her he may become unclean. ⁴ He shall not become unclean as a relative by marriage among his people, and so profane himself. ⁵ The priests ^[a]shall not shave their heads, nor shave off the edges of their beards, nor make any cuts in their body.