Leviticus 20:14
“‘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.
World English Bible (Public Domain)
In context
Before · Leviticus 20:12–13
12“‘If a man lies with his daughter-in-law, both of them shall surely be put to death. They have committed a perversion. Their blood shall be upon themselves. 13“‘If a man lies with a male, as with a woman, both of them have committed an abomination. They shall surely be put to death. Their blood shall be upon themselves.
14“‘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.