Leviticus 21:1-3
Holiness and the Priests
1 And the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them, a No one shall make himself unclean for the dead among his people, 2 except for his closest relatives, 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 make himself unclean).
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