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Let's say someone was asked "are you going to shul tomorrow?" and the other person answers "yes." Does that count as a Neder?

BTW Rav Mutzafi says that Nedarim are only on Mitzvot, Torah etc.

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I don't think you are interpreting R. Mutzafi correctly. There are many cases in m. nedarim dealing with someone who is moder hanaa. – YDK Jan 8 '12 at 17:35
@YDK Exact language: זה לא נדר , כי רק בעניני מצוות זה נדר , ולא בעניני חול . – Hacham Gabriel Jan 8 '12 at 17:40
Also, yes you are correct, but it really depends. The Halachot are very complicated. There is even a Gemara in Gitin about this I believe. – Hacham Gabriel Jan 8 '12 at 17:41
Could you post the case, he say "ze lo neder". That may clarify his intent. – YDK Jan 8 '12 at 17:57
One could interpret that as saying that since she did not use a language of neder or shevua, it doesn't take hold. But when there is a mitzva, even a weaker language is sufficient. (I'm not saying he is saying that, but it's an example of an interpretation that is more plausible than "nedarim are only on mitzvos.) – YDK Jan 8 '12 at 21:45

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