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Why can sukkah override Shabbos (שבת) while mezuzah cannot, according to the yado achira principle? The shiur develops two competing approaches: either avoidable mitzvos create no real conflict with Shabbos, or they're inherently lighter than unavoidable ones. The Chasam Sofer's question about korban Pesach (פסח) tests which approach works better.
This shiur examines a fundamental Gemara (גמרא) in Masechta Shabbos (שבת) regarding the principle of 'yado achira' - the ability to avoid a mitzvah (מצוה) obligation. The Gemara establishes that while one may build a sukkah on Shabbos, one cannot put on tefillin or mezuzah because of yado achira - since these mitzvos can be avoided (by not entering a house or not wearing a four-cornered garment), they don't override Shabbos prohibitions. Rabbi Zweig presents two fundamentally different approaches to understanding this Gemara. The first approach, suggested by a student named Boruch, argues that yado achira means there is no actual conflict between the mitzvah and Shabbos since one can remove themselves from the obligation entirely. The second approach argues that mitzvos which can be avoided are inherently lighter (kal) compared to unavoidable mitzvos like sukkah, and therefore lack the strength to override Shabbos.
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Shabbos 131a-b
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Why does the Gemara say one Shabbos protects from Amalek while two Shabboses bring redemption? The shiur applies a principle from Kiddushin about repetition changing psychology: the first time doing anything is experimental, but the second demonstrates genuine desire. True Shabbos connection with Hashem requires moving beyond spiritual curiosity to authentic internalization.
