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The situation is that I am currently living in dorm rooms with a Jewish person who has decided to keep Shabbat. I am a Jew who does not keep Shabbat, but I respect my dorm mate and do not want to inadvertently cause him to break Shabbat. So, I think it might be helpful, during Shabbat, to ask him if he wants the lights turned off or on and help out accordingly.

Therefore, I'm wondering: Can a Jew who is keeping the Shabbat rules ask another Jew who is not keeping shabbat to turn on/off the lights?

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Definite no-no. Make sure to ask a rabbi who is familiar with the situation for a final ruling, or better yet, just ask your friend what he wants you to do. –  Double AA Oct 4 '13 at 16:01
Your roommate would not be allowed to benefit from actions you do on his behalf if they violate Shabbat (lights on/off, etc.). You're not causing him to break Shabbat, but you aren't helping him by breaking it for him. –  Seth J Oct 4 '13 at 16:11
@DoubleAA, I've attempted to edit for de-pesakifying. I think this is an important question that would be good to have a general answer to as an actual Answer. –  Isaac Moses Oct 4 '13 at 18:15
@SAH, LOL! It sure doesn't look like it to me! –  Seth J Oct 4 '13 at 19:34
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1 Answer

By turning on the light at his request, you would be causing him to violate the commandment of "lifnei 'iver -- placing a stumbling block before the blind." The Rabbis interpret this to forbid one Jew to cause another to sin.

See MT Laws of Murder 12:14 for source.

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