Ex. 20:14You shall not commit adultery.
Adultery is the sin of a married man having sexual relations with anyone other than his wife, or a married woman having sexual relations with anyone other than her husband.
Matt. 5:27You have heard that it was said, “Do not commit adultery.” 28But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.
Three Levels of Adultery: