NUM179 There are also many who stumble and are ensnared [in sin by] profaning the more significant of the senses – – the senses of sight and of sound. Concerning the sense of sight, the pasuk [this verse] says, "You must not explore after your heart and your eyes." Herein we have been admonished that one must not gaze at a married woman or any other woman where relations are forbidden, lest he stumble [in sin] with them.