Leviticus 18:14
Do not have intercourse with your uncle’s wife; she is also your aunt.
Do not engage in sexual relations with your granddaughter; that would bring you dishonor.
Do not engage in sexual relations with your sister or your stepsister, whether raised in the same household or elsewhere.
Do not have intercourse with your father or your mother; she is your mother; do not have intercourse with her.
Legal Code None of you shall engage in sexual intercourse with a blood relative; I am the Lord.
Observe my practices and ordinances, for those who keep them will find life; I am the Lord.