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Why did Avrohom remarry Hagar (Keturah) after Sarah explicitly demanded her expulsion? The shiur develops the concept that Bnei Keturah fulfill the covenant of "Av Hamon Goyim"—nations separated from idolatry through bris milah yet distinct from Am Yisrael. They serve as the bridge connecting Klal Yisrael to the rest of humanity in the ultimate mission of bringing all nations under divine service.
The shiur opens with the fundamental question posed by Parshas Chayei Sarah: after Sarah Imeinu demanded that Avrohom expel Hagar and Yishmael, and Hashem (ה׳) commanded "kol asher tomar Sarah shma bekolah," how could Avrohom now remarry Keturah (identified by Rashi (רש"י) as Hagar)? The original expulsion was based on "ki lo yirash ben ha'ama im beni"—the son of the maidservant shall not inherit with my son. Yet now Avrohom creates new potential heirs through his marriage to Keturah, and the Gemara (גמרא) in Sanhedrin 91a confirms that Bnei Keturah actually claimed inheritance rights to Eretz Yisrael before Alexander of Macedon. How does this not violate Sarah's original concern? Rabbi Zweig resolves this by distinguishing between two fundamentally different types of inheritance. There is ordinary property inheritance—the wealth and land Avrohom possessed as a private individual. But there is also spiritual inheritance—the covenants between Hashem and Avrohom that would be passed down to form Am Yisrael. Sarah's concern of "ki lo yirash" was never about property; it was about who would constitute the eternal Jewish people. The question was existential: who will be Am Yisrael? Avrohom initially hoped "lu Yishmael yichye lefanecha"—that both Yishmael and Yitzchok would form the nation. Sarah insisted otherwise, and Hashem's response "ki b'Yitzchok yikarei lecha zara" established that only through Yitzchok would the spiritual seed of Israel be established. This pasuk excludes Yishmael and later Bnei Keturah from being part of Am Yisrael, but does not exclude them from material inheritance of property.
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Bereishis 25:1-6 (Parshas Chayei Sarah)
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