Leviticus 21:2-4

Darby Translation

² except for his immediate relation, who is near unto him—for his mother, and for his father, and for his son, and for his daughter, and for his brother;

³ and for his sister, a virgin, that is near unto him, who hath had no husband, for her may he make himself unclean.

⁴ He shall not make himself unclean [who is] a chief among his peoples, to profane himself.