Leviticus 21:1-4
The Holiness of the Priests
1 The Lord said to Moses: “Speak to Aaron’s sons, the priests, and tell them: A priest is not to make himself ceremonially unclean for a dead person among his relatives,(A)
2 except for his immediate family: his mother, father, son, daughter, or brother.
3 He may make himself unclean for his young unmarried sister in his immediate family.
4 He is not to make himself unclean for those related to him by marriage(a) and so defile himself.
Footnotes:
a.
Leviticus 21:4: Lit unclean a husband among his people