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What distinguishes between different types of machshirei milah that override Shabbos (שבת)? The Rashba's ruling reveals two categories: carrying implements is chelek hamitzvah (part of the mitzvah (מצוה) itself), while making implements is merely necessary preparation. This explains why one should make a knife before Shabbos rather than carry it on Shabbos for a bris.
This shiur provides an in-depth analysis of Shabbos (שבת) 130a, focusing on the machlokes between Tosafos (תוספות) and the Rashba regarding machshirei milah (preparations for circumcision that override Shabbos). Rabbi Zweig begins by reviewing yesterday's discussion about whether the din of machshir milah represents a halachic principle that milah overrides Shabbos, or whether it's merely a practical ruling for mohalim. The Rashba learns the sugya as a principle of dechiya (overriding), while Tosafos holds it's about the concept that milah overrides Shabbos, including situations where you'll eventually need chillul Shabbos. A key insight emerges from the Rashba's ruling about choosing between carrying a knife or making a knife on Shabbos when both involve equal chillul Shabbos. The Rashba rules that one must carry rather than make, explaining that carrying is l'tzorech milah (for the need of circumcision) while making a knife is not exclusively l'tzorech milah since the knife can be used for other purposes. This leads to a fundamental distinction between two types of machshirim: those that are a chelek hamitzvah (part of the mitzvah (מצוה)) versus those that are merely necessary preparations but not part of the mitzvah itself.
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Shabbos 130a
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