Matthew 5:28-29

28 But what I tell you is this: A man may look at a woman who is not his wife. And he may want to have sex with her. In his thoughts he has had sex with her, so he has done a wrong thing. 29 If your right eye causes you to do wrong things, then you should take it out. You should throw it away. Yes, you will lose one eye. But it will be much worse if you keep your whole body and God throws you into hell.