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Why does the Gemara (גמרא) allow marbe eitzim levatla in the tanur when ein mevatlin issur lechatichila prohibits nullifying issurim? The shiur distinguishes between being mevatel an issur to make it permitted versus changing proportions to avoid benefiting from the issur itself. Tosfos reveals that marbe eitzim addresses hanaa, not bittul, unlocking the principle of mikleh kol issur where the issur object is consumed and disappears entirely.
The shiur begins by analyzing a Tosfos on Beitza 4b that appears to be explaining the Gemara (גמרא)'s question and answer about "ein mevatlin issur lechatichila." Rabbi Zweig questions why Tosfos needs such an elaborate explanation when the words seem straightforward. The key insight is that Tosfos is fundamentally reframing how we understand the Gemara's question. Rabbi Zweig proposes that Tosfos is not understanding the Gemara's kasha to be about the issur of being mevatel (nullifying) an issur lechatichila (from the outset). Rather, the kasha is that even if you are mevatel the issur, ein mevatlin issur lechatichila means it's not actually batel - you cannot benefit from it afterward. The Gemara asks: if ein mevatlin issur lechatichila means the issur remains despite your efforts, how can one benefit from wood that includes muktza (wood designated for burning an idolatrous ashera)?
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Beitza 4b
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