3 or an unmarried sister who is dependent on him since she has no husband—for her he may make himself unclean.

Read Leviticus 21:3 Using Other Translations

And for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.
or his virgin sister (who is near to him because she has had no husband; for her he may make himself unclean).
or his virgin sister who depends on him because she has no husband.