Study Sukkah folio 2A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
Mishnah: A sukka, i.e., its roofing, which is the main and most crucial element of the mitzva, that is more than 20 cubits high is unfit. R' Yehuda deems it fit.
Similarly, a sukka that is not even 10 handbreadths high, and one that does not have 3 walls, and one whose sunlight that passes through its roofing is greater than its shade are unfit.
Talmud: We learned a similar halakha in a Mishnah there, in tractate Eiruvin (2a): In the case of an alleyway that is higher than 20 cubits, i.e., the beam that was placed across the end of an alleyway that opens into a public domain in order to permit carrying within the alleyway on Shabbat is h
Given the seeming similarity between the two cases, that of the sukka and that of the alleyway, the Talmud asks: What is different with regard to a sukka where the Mishnah teaches that it is unfit, and what is different with regard to an alleyway where the Mishnah teaches the method of rectification
The Talmud answers: With regard to sukka, since it is a mitzva by Torah law, the Mishnah teaches that it is unfit, as, if it is not constructed in the proper manner, no mitzva is fulfilled. However, with regard to an alleyway, where the entire prohibition of carrying is only by rabbinic law, th