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Why does the Gemara (גמרא) say "lo teish meir vedol miria" (your seeing is no worse than testimony) when Beis Din sees the new moon themselves? Rashi (רש"י) holds Kiddush HaChodesh isn't a judicial process requiring witnesses—it's a sovereign act (kazeroy vekadesh), so when Beis Din sees directly, they function as the nation's representatives and declare "mekudesh mekudesh" themselves. A fascinating analysis contrasts Rashi and Tosafos (תוספות) and unpacks the Rambam (רמב"ם)'s formulation.
This shiur offers a deep analysis of Rosh Hashanah 25b, focusing on the nature of Kiddush HaChodesh (sanctifying the new month) and whether Beis Din's role in this process is judicial or sovereign. The question arises from the Gemara (גמרא)'s statement that if Beis Din themselves saw the new moon, "lo teish meir vedol miria" (your seeing is no worse than testimony). What exactly does this principle mean, and what is the halachic mechanism at work? Rabbi Zweig explains that according to the Rambam (רמב"ם), Kiddush HaChodesh is not a judicial function of Beis Din but rather a sovereign responsibility. It is a din of Beis Din as malchus—an expression of Beis Din HaGadol functioning as the sovereign body of the Jewish nation. This is fundamentally different from a court case that requires witnesses and judicial procedures.
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Rosh Hashanah 25b
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