Deuteronomy 27:23

Cursed be he that lieth with his mother in law. And all the people shall say, Amen.

Leviticus 20:14

And if a man take a wife and her mother, it is wickedness: they shall be burnt with fire, both he and they; that there be no wickedness among you.

Leviticus 18:17

Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.

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King James Version Public Domain