Leviticus 18:17-19
New American Bible (Revised Edition)
17 You shall not have intercourse with a woman and also with her daughter, nor shall you marry and have intercourse with her son’s daughter or her daughter’s daughter;(A) they are related to her. This would be shameful. 18 While your wife is still living you shall not marry her sister as her rival and have intercourse with her.(B)
19 You shall not approach a woman to have intercourse with her while she is in her menstrual uncleanness.(C)
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