Matthew 5:27-29

27Ye have heard that it has been said, Thou shalt not commit adultery.

28But I say unto you, that every one who looks upon a woman to lust after her has already committed adultery with her in his heart.

29But if thy right eye be a snare to thee, pluck it out and cast it from thee: for it is profitable for thee that one of thy members perish, and not thy whole body be cast into hell.