Leviticus 18:7-9

Good News Translation

⁷ Do not disgrace your father by having intercourse with your mother. You must not disgrace your own mother. ^8 (A)Do not disgrace your father by having intercourse with any of his other wives. ^9 (B)Do not have intercourse with your sister or your stepsister, whether or not she was brought up in the same house with you.