Leviticus 20:10-12

10And the man that committeth adultery with another man’s wife, even he that committeth adultery with his neighbor’s wife, the adulterer and the adulteress shall surely be put to death. 11And the man that lieth with his father’s wife hath uncovered his father’s nakedness: both of them shall surely be put to death; their blood shall be upon them. 12And if a man lie with his daughter-in-law, both of them shall surely be put to death: they have wrought confusion; their blood shall be upon them.