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Does adding a fifth species to the lulav violate bal tosif? The shiur distinguishes between two types of bal tosif—adding to the cheftza shel mitzvah (מצוה) versus performing two complete ma'aseh mitzvahs—and develops Rabbeinu Chananel's approach that the Gemara (גמרא)'s discussion concerns whether one fulfills the mitzvah, not whether one transgresses bal tosif.
The shiur undertakes a complex analysis of Sukkah 31a-b, focusing on the sugya of adding to the arba minim and whether this constitutes bal tosif. The central question is whether adding a fifth species (such as an extra lulav or esrog) invalidates the mitzvah (מצוה) or violates bal tosif. Rabbi Zweig begins by examining the dispute between Tosfos and Rabbeinu Chananel regarding the Gemara (גמרא)'s statement "keshem she'im pochas kach im mosif alav." Tosfos understands this applies even within the agudah (bundle), while Rabbeinu Chananel limits the discussion to cases within the agudah according to the Rabanan. The fundamental question is whether adding minim is problematic according to Rabbi Yehuda (who holds lulav tzorech agudah) versus the Chachamim (who hold lulav ein tzorech agudah).
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Sukkah 31a-b
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