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Does kavah zukak lo mean you must relight extinguished Chanukah (חנוכה) candles as a separate obligation, or that the original lighting was invalid? Rashi (רש"י) holds relighting is a second mitzvah (מצוה), making questionable wicks permissible on Friday since there's no Shabbos (שבת) relighting obligation. Tosafos (תוספות) argues extinguishing invalidates the original mitzvah entirely.
This shiur presents a comprehensive analysis of the Talmudic principle of 'kavah zukak lo' (if it extinguishes, he must relight it) in the context of Chanukah (חנוכה) candles, based on Masechta Shabbos (שבת) daf 21. The discussion centers on a fundamental dispute between Rashi (רש"י) and Tosafos (תוספות) regarding the nature of the obligation to relight extinguished Chanukah candles. Rashi maintains that when Chanukah candles are initially lit, the mitzvah (מצוה) is fulfilled even if they later extinguish. The requirement to relight (kavah zukak lo) represents a second, separate obligation. According to this view, the concern of 'dilma poshe v'lo mesaken lo' (perhaps he will be negligent and not fix it) applies only to this secondary obligation, not the original lighting. This interpretation explains why there would be no problem using such wicks on Friday night - since there's no obligation to relight candles on Shabbos, the secondary concern doesn't apply.
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Shabbos 21a
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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.
