Leviticus 21:1-4

1And the LORD said to Moses, Speak to the priests the sons of Aaron, and say to them, There shall none be defiled for the dead among his people:

2But for his kin, that is near to him, that is, for his mother, and for his father, and for his son, and for his daughter, and for his brother,

3And for his sister a virgin, that is near to him, who hath had no husband; for her he may be defiled.

4But he shall not defile himself, being a chief man among his people, to profane himself.1