Leviticus 20:14

If a man takes a woman and her mother also, it is depravity ; he and they shall be burned with fire , that there may be no depravity among you.

“‘If a man marries both a woman and her mother, it is wicked. Both he and they must be burned in the fire, so that no wickedness will be among you.

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.