Leviticus 18:7-9
New American Bible (Revised Edition)
7 [a]You shall not disgrace your father by having intercourse with your mother.(A) She is your own mother; you shall not have intercourse with her. 8 You shall not have intercourse with your father’s wife, for that would be a disgrace to your father. 9 You shall not have intercourse with your sister,[b](B) your father’s daughter or your mother’s daughter, whether she was born in your own household or born elsewhere.
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