Leviticus 20:14
If a man marries both a woman and her mother, it is depraved. Both he and they must be burned in the fire, so that there will be no depravity among you.
Berean Standard Bible
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.
“‘If a man takes a wife and her mother, it is wickedness. They shall be burned with fire, both he and they, that there may be no wickedness among you.