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.
Leviticus 20:14
And if a man takes 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.
Deuteronomy 27:23
Cursed is he that lies with his mother-in-law. And all the people shall say, Amen.
Amos 2:7
desiring that there be dust of the earth upon the head of the poor, and to twist the way of the humble: and the man and his father have gone in unto the same maid, profaning my holy name: