But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart.
Matthew 5:28
Surrounding context
5:27 "You have heard that it was said to those of old, "You shall not commit adultery.'
5:28 But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart.
5:29 If your right eye causes you to sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell.