Leviticus 21:3-6

³And for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.

⁴But he shall not defile himself, being a chief man among his people, to profane himself.

⁵They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.

⁶They shall be holy unto their God, and not profane the name of their God: for the offerings of the LORD made by fire, and the bread of their God, they do offer: therefore they shall be holy.