Reference

Leviticus 21:3

And for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.
1

And the Lord said unto Moses, Speak unto the priests the sons of Aaron, and say unto them, There shall none be defiled for the dead among his people:

2

But for his kin, that is near unto him, that is, 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 nigh unto him, which hath had no husband; for her may he be defiled.

4

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

5

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