74a bottom
Acc to man deomar that you need mufneh from both sides. The gemoro asks where is it mufneh from the maaser side.
Why can't the gemoro just answer simply, (without being doche reb avohu) since we see the 3rd mimenu by pesach is not necessary, (its just agav the other drosho of: ad boker etc.) So we can shodi one on the lomed of pesach, and one mimenu, you can shodi on the melamed of maaser?
I just saw the artscroll. They explain that "aidee dichsiv" is like a parsha which is chozro vnishnis because of a new chiddush we repeat the whole parsha. They prove this from the top tosafos in 71a who says so in the narrow lines.
In which case my question is stronger. Why can't we just use the extra mimenu to make it mufneh from both tzedodim, instead of pattruring from darshening because we have no drosho to make, and instead saying that its all agav.
Avrumi Hersh, London england
1) I think the answer might be that Pesach is only Mufneh from one side (see Rashi, end of 74a, DH Mufneh), but the Gemara above (70a) states that one can only say "Shadi" if we have Mufneh from both sides (see Rashi to 70b, DH Shadi).
2) I also want to say that we learn from Rashi (70b DH Keivan), who writes that there are two extra verses, that we say "Shadi" only when we have two extra verses, while on 74a there is only one extra "Mimenu: by Pesach so we cannot say "Shadi."
3) I think that the Mitzpeh Eisan, printed at the back of the Gemara here, asks this question. He answers that the opinion that maintains that may challenge a Gezeirah Shavah if it is only free on one side is the opinion of Rebbi Eliezer (70b), and one must say that according to Rebbi Eliezer if a Parshah is written without reason, one does not make a Derashah, since Rebbi Eliezer says in Pesachim 77b (first wide line) that even if one could learn something from a Kal va'Chomer, the Torah still writes a verse.
Kol Tuv,
Dovid Bloom