Leviticus 18:9

Overview - Leviticus 18
Unlawful marriages, and unlawful lusts.
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Leviticus 18:9  (King James Version)
The nakedness of thy sister, the daughter of thy father, or daughter of thy mother, whether she be born at home, or born abroad, even their nakedness thou shalt not uncover.

20:17 Deuteronomy 27:22 ; 2 Samuel 13:11-14 ; Ezekiel 22:11