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Why is chatzi shiur (less than the required measure) forbidden on Yom Kippur when it's not a chefetz ha'issur (inherently forbidden object)? The shiur explores the machloket between Rabbi Yochanan and Reish Lakish: Rabbi Yochanan holds chatzi shiur constitutes a ma'aseh achilah (act of eating), thereby negating the mitzvah (מצוה) of fasting, while Reish Lakish holds it's not considered eating at all.
This shiur provides a deep analysis of the Gemara (גמרא) in Yoma 73b-74a, focusing on the fundamental nature of the prohibition of chatzi shiur (eating less than the minimum measure) and its application to Yom Kippur. The discussion begins with Rashi (רש"י)'s position that chatzi shiur applies to all three prohibitions on Yom Kippur, raising questions about the relationship between the issur (prohibition) and the concept of chatzitza (separation). The central question emerges: Why does the Mishna use the language "asur" (forbidden) for Yom Kippur when eating and drinking are punishable by karet? Rashi explains that the Mishna emphasizes chatzi shiur is forbidden, leading to a fundamental inquiry into how chatzi shiur operates. The shiur presents a novel insight from Rashi: chatzi shiur is only an issur when one does NOT complete the full shiur. If one eats a full kezayit within the time frame, there is no separate violation of chatzi shiur—only the violation of eating the full measure. This prevents the absurd result that eating one kezayit would constitute millions of violations (one for each molecule).
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Yoma 73b-74a
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