The nakedness of your father, or the nakedness of your mother, shall you not uncover: she is your mother; you shall not uncover her nakedness.
Leviticus 20:11 And the man that lies with his father's wife has uncovered his father's nakedness: both of them shall surely be put to death...
Ezekiel 22:10 In you have they discovered their fathers' nakedness: in you have they humbled her that was set apart for pollution.