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How did Chazal understand hemophilia genetics when determining circumcision postponement for jaundiced infants? The Gemara (גמרא)'s precise language reveals sophisticated knowledge of X-linked inheritance through maternal lines. This medical accuracy in halacha (הלכה) demonstrates that observable symptoms, not statistical risks, guide halachic decisions about infant safety.
This shiur provides an in-depth analysis of Gemara (גמרא) Shabbos (שבת) 134a, beginning with a discussion of the permissibility of certain activities on Yom Tov under the principle of ochel nefesh (food preparation needs). Rabbi Zweig explores whether derivative melachos (tolados) being permitted can allow the primary melacha (av), using the example of building on Yom Tov where kindling (a tolada) is permitted for food but building (the av melacha) remains forbidden. The Gemara then transitions to detailed medical advice for infant care, including proper bandaging techniques to prevent skin damage, treatments for breathing difficulties, and remedies for various newborn ailments. Rabbi Zweig notes how some remedies appear logical while others seem more mystical in nature, reflecting the mixed medical understanding of the time.
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Shabbos 134a
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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.
