Bible: Leviticus 20:17

20:17‘If a man has sexual intercourse with 1  his sister, whether the daughter of his father or his mother, so that he sees her nakedness and she sees his nakedness, it is a disgrace. They must be cut off in the sight of the children of their people. 2  He has exposed his sister’s nakedness; he will bear his punishment for iniquity. 3 

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