I remember learning that the reason for the rule that a non obligated person cannot do a mitzvah on behalf of an obligated person is because it's more difficult for the obligated person. What is the source for this?

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    Are you asking for a source for the idea that it’s more difficult for an obligated person, or a source that that is the reason that one who is not obligated cannot fulfill a mitzvah on behalf of one who is? – Joel K Sep 5 '18 at 5:35
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    the problem is that the reason is for גדול המצוו ועושה but not for the second din – kouty Sep 5 '18 at 7:22
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    Isn't the reason because he cannot be shaliach for this ?... (Something like in Qidushin 41b) Anyway, Rosh Hashana 29a could be a good point of start. – yO_ Sep 5 '18 at 7:31

The source that someone cannot do a mitzvah for someone who is not obligated is (very timeously!) a mishna in Rosh haShana 29a (or 3:8)

Anyone who is not obligated in something, cannot fulfill the obligation for others.

I am not aware of a source connecting this to the source in Avodah Zara which @Shmuel linked to, that it is considered greater to do a mitzvah if one is obligated.

In other words, the connection is false. (However, I would be happy to hear of a source connecting them if someone knows of one.)

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  • You cannot see it, but I already answered this on the basis of berachot 20b. But this is called reason – kouty Sep 5 '18 at 10:29
  • I don't understand your comment – Josh Friedlander Sep 5 '18 at 13:37
  • I answered the same answer but from an other Gemara. But people said me that this is a source for the law, not for the reason, so I cancelled it. This question is perhaps a result of a mistaken condensation of two formally different topics – kouty Sep 5 '18 at 14:37

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