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How does the principle "chazakas eim mahani lebas" work when we don't know who the father is? The shiur develops a chiddush that chalal status passes through the mother, not directly from father to child. This resolves why the mother's chazaka can help the daughter despite our uncertainty about paternity.
This shiur analyzes a complex sugya in Kesubos 13b regarding the principle of "chazakas eim mahani lebas" (the chazaka of the mother benefits the daughter). Rabbi Zweig begins by examining Rav Kiveger's approach to understanding why the Mishna mentions "nosenu lemamzer" rather than simply "goy," which would seem to present a stronger case. Rav Kiveger explains that this teaches the chiddush that even with rov kosher, Rabbi Yehoshua still considers her pasul. The core difficulty emerges: if we have a safek regarding who the father is - potentially a mamzer, chalal, or kosher person - how can the mother's chazaka help determine the daughter's status? The mother's chazaka can only tell us that we lack sufficient evidence to disqualify her, but it cannot positively identify who the father was. This creates a fundamental problem in understanding how "chazakas eim mahani lebas" functions.
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Why does halacha forbid entering dangerous places if everything happens by Divine decree? The shiur examines the debate between Rashi and Tosfos on traveling at night, developing a fundamental distinction: Rashi holds one must avoid even deserved punishments that Hashem delays through mercy, while Tosfos holds the prohibition addresses self-inflicted harm through free will. This framework reveals how people rationalize self-destructive behavior as "hashgacha."
Why does the Gemara praise hospitality to scholars as a unique mitzvah rather than ordinary hachnasas orchim? The shiur distinguishes two mitzvahs: hachnasas orchim (providing for those in need) and connecting to talmidei chachamim (cleaving to God through scholars). Yisro's meal for the Jewish leaders wasn't charity—it was his way of bonding with those transformed by Torah, teaching that learning must fundamentally change who we are.
Kesubos 13b
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