Leviticus 21:3

He may also do so for his unmarried sister who is close to him, since she has no husband.

Leviticus 21:3, Readable English Bible (READ)

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Previous · Leviticus 21:2He may do so only for his close family. That means his mother, father, son, daughter, or brother. Next · Leviticus 21:4He must not make himself unclean for those related to him by marriage. That would make him unholy.