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We learned in the mishna (33.2): “Rabbi Yosi: On the first day of Yom Tov which falls on Shabbos, if one forgot and carried out his lulav, he is pottur because he took it with mitzvah-permission.”

 Summary 

 Rav Huna: Rabbi Yosi: If a kohen ate an Olah bird thinking it was a Chatos bird, he is pottur [he need not bring a korban meilah because he was “mistaken with regard to a mitzvah”]. 

 Challenge: Why must this be taught again? It was already taught in our mishna. 

 Resolution: With regard to the lulav he actually did a mitzvah but the kohen who ate an olah didn’t do a mitzvah. 

 Challenge: Rabbi Yosi: If one slaughtered a Tomid on Shabbos, which wasn’t properly checked (it must be examined for 4 days first to ensure that it does not have a mum), he is guilty and another Tomid is necessary. 

 Rav Huna: That case cannot be considered here, because it was learned about that: Rav Shmuel bar Chasoi amar Rav Hamnuna Sava amar Rav Yitzchok bar Ashian amar Rav Huna amar Rav: It is a case where the animal was taken from the place of unexamined animals*. [It is thus not an error in a mitzvah matter but carelessness and negligence]. 

* Tosfos: Even if it is later found to be unblemished, the sacrifice is still not valid, because the 4 day examination is a condition in the korban which is derived from korban pesach.