Leviticus 21:3-6 New American Standard Bible (NASB)

3. also for his virgin sister, who is near to him because she has had no husband; for her he may defile himself.

4. He shall not defile himself as a relative by marriage among his people, and so profane himself.

5. They shall not make any baldness on their heads, nor shave off the edges of their beards, nor make any cuts in their flesh.

6. They shall be holy to their God and not profane the name of their God, for they present the offerings by fire to the Lord, the food of their God; so they shall be holy.

Leviticus 21