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Rabbah: Since the tefach creates a third wall for sukkos, it is also considered a walled-in area with regard to Shabbos. Abayye challenged him from a beraisa: “Sukkah walls are like Shabbos walls, but Shabbos has a limitation that sukkah does not: A Shabbos wall must have more area of standing wall than open area.” Resolution: The limitation is only for Shabbos during the year. On sukkos, since it’s a valid wall for sukkah it’s valid for Shabbos as well.

Summary

Abayye originally understood the quoted beraisa as being in opposition to the principle of migo. However Rabbah had explained that the beraisa agrees with migo, and we can apply the leniencies of sukkah to Shabbos.

Challenge: If the beraisa agrees with migo then we can surely apply the leniencies of Shabbos to sukkah as well. So why doesn’t the beraisa mention the leniency of Rabbah: If a lechi was made in order to permit carrying in a mavuy on Shabbos, one can place schach on it and use it as a sukkah (even though its third wall does not have a tefach)?

Resolution: Once the beraisa teaches that migo applies and laws of sukkah which is only an asei can thus be applied to the more stringent Shabbos, it is no longer necessary to teach that laws of Shabbos can be applied to the more lenient sukkah.

Rabbi Miller: “If you don’t understand today’s gemara, you don’t need to have an inferiority complex. If you do understand it, you deserve a compliment!”