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Why does eating less than a kezayis on Yom Kippur violate a Torah (תורה) prohibition? The Minchas Chinuch argues it cannot stem from lo se'aneh (which has no chatzi shiur as an issur gavra), but rather from the obligation to be shoves—resting from eating. The machlokes Rabbi Yochanan and Reish Lakish thus hinges on whether any amount constitutes ma'aseh achilah, thereby negating shevitah.
This shiur delves into a fundamental question about chatzi shiur (eating less than the standard measure) on Yom Kippur. The Gemara (גמרא) in Yoma 73b–74a discusses whether one violates a prohibition by eating less than a kezayis (olive's bulk) on Yom Kippur, and it attributes the prohibition to chatzi shiur, connecting it to the machlokes between Rabbi Yochanan and Reish Lakish regarding whether chatzi shiur is prohibited. Rabbi Zweig presents the approach of the Minchas Chinuch, who argues that there cannot be a Torah (תורה)-level prohibition of chatzi shiur stemming from the negative commandment of lo se'aneh (the prohibition against eating on Yom Kippur). His reasoning is that lo se'aneh is an issur gavra (a prohibition on the person) rather than an issur cheftza (a prohibition on the object), and chatzi shiur only applies to issurim that are issur cheftza. The Minchas Chinuch draws a parallel to chametz on Pesach (פסח): since the person was permitted to eat chametz before Pesach (yeish heteira), chatzi shiur does not apply. All the more so on Yom Kippur, where fasting is purely an obligation on the person, chatzi shiur of lo se'aneh should not exist.
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Yoma 73b-74a
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