Leviticus 21:1-4 Christian Standard Bible (CSB)
The Holiness of the Priests
21 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, 2 except for his immediate family: his mother, father, son, daughter, or brother. 3 He may make himself unclean for his unmarried virgin 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.