Leviticus 21:1-3

Revised Standard Version

The Holiness of Priests

21 And the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them that none of them shall defile himself for the dead among his people, ² except for his nearest of kin, his mother, his father, his son, his daughter, his brother, ³ or his virgin sister (who is near to him because she has had no husband; for her he may defile himself).