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What does Ben Azai's principle of mahalech komed domi (walking is like stopping) mean for Shabbos (שבת) carrying liability? Tosafot reads this as each step creating an actual hanacha, while the Rif sees it as mere presence without hanacha. The analysis reveals how these different understandings of akira and hanacha reshape the fundamental nature of the melacha of hotza'ah.
This shiur provides an in-depth analysis of a fundamental dispute in Shabbos (שבת) law between Ben Azai and the Chachamim regarding the principle of mahalech komed domi (walking is like stopping). The discussion centers on Masechta Shabbos 5b and explores how this principle affects liability for carrying between domains on Shabbos. The shiur examines different interpretations of this principle by major Rishonim, particularly Tosafot and the Rif. According to Tosafot, Ben Azai holds that when someone walks while carrying an object, each step constitutes an actual hanacha (placing down), making them liable if they subsequently decide to carry the object out. The Rif, however, interprets mahalech komed domi differently - as merely indicating presence at a location without constituting an actual hanacha. The shiur explores how this dispute relates to the halacha (הלכה) Moshe miSinai of carrying four amos in reshus harabim, examining why Ben Azai's position doesn't contradict this established law. The analysis delves into fundamental questions about what constitutes akira (picking up) and hanacha (putting down) in Shabbos law, and whether the melacha of hotza'ah is defined by crossing boundaries between domains or by the physical act of carrying. The discussion includes analysis of related sugyot in Masechta Ketubot regarding theft and Shabbos violation, showing how these principles apply in complex scenarios. Throughout, the shiur demonstrates how different conceptual approaches to the nature of domain change (shinui reshuyot) lead to practical halachic differences in determining liability for Shabbos violations.
Shabbos 5b
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