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If "Reuven" believes the halacha to be one way and "Shimon" believes it to be more lenient may Reuven rely on Shimon to do something for him based on this leniency?

Here is a 100% fictional practical example to illustrate the concept that I am asking about, please note I am NOT posing this as the actual question, the actual question is what was stated above: Reuven's Rav has given a psak that not using a kli sheini is bishul m'deoraita. Shimon's Rav holds you can use a kli rishon. Can Reuven drink a tea made for him by Shimon?

Loewian
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    Might I suggest you remove the "or does he have a mitzvah to rebuke Shimon instead", which is a separate question? – msh210 Feb 23 '12 at 21:20
  • Even if you have to rebuke him you may be able to rely on it bdeieved (if someone carried a candy to your house on Shabbos through a true Reshus Harabim one could still eat it (defiantly after Shabbos Bichdei Sheyaaseh)). 2. One may not have to rebuke him but could still not rely on him Bedieved (for example, Sefardim can eat kitnios on Pesach lechatchila but an Ashkenazi can't eat a rice cake cooked by a Sefardi even Bdieved).
  • – ertert3terte Feb 23 '12 at 21:24
  • @msh210 good call. I was curious about the second part but it doesn't belong in this question, I have removed it. – none Feb 23 '12 at 21:30
  • Who holds that putting raw food in a kli rishon of hot liquid is NOT bishul d'oraisa??? –  Feb 23 '12 at 21:37
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    @Will this is just a completely fabricated example – none Feb 23 '12 at 21:51
  • @Moshe it makes a real difference. I might eat a dairy meal at in a religious family's home, without asking questions, even if they eat chalav stam, and I usually don't. However, I would never eat in a home where they thought that milk from non-kosher animals is kosher! –  Feb 23 '12 at 22:11
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    are you asking qua maaseh shabbat or qua lifnei iver? – Double AA Feb 23 '12 at 22:27
  • Moshe, if, as I suspect, you're asking a general question, "can I use the result of Shimon's actions if I believe them to be forbidden and he doesn't?", and don't care about the example, then perhaps leave the specific example out or specify clearly that you don't care about it, inasmuch as both Will and Double AA have, as you see, focused on details of the example. – msh210 Feb 24 '12 at 00:10
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    I have amended the question. I opted to leave the example in because I think the question itself is abstract and I'm hoping an example will better illustrate the concepts. If someone would like to pose a better example I'm happy to replace. – none Feb 24 '12 at 01:32
  • @Moshe I think you misunderstood. The nature of the case is key as every case has it's own issues. – Double AA Feb 24 '12 at 06:39
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    @msh210 I think you misunderstood my comment. No matter what the case, there are two perspectives one can approach from: the issue of causing a sin and the issue of benefiting from it. I used the shabbos terms, but those are the general questions for any case he brings. (Each case of course will have different ways of balancing the two...but see my previous comment for that.) – Double AA Feb 24 '12 at 06:41
  • Closely related: http://judaism.stackexchange.com/questions/10240 – msh210 Feb 26 '12 at 22:55