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Why did Avrohom marry off Yitzchok before remarrying himself, seemingly violating the halacha (הלכה) that one must marry before his son? The shiur develops a fundamental understanding that zikna (old age) represents not deterioration but accomplishment—a sense of having actualized one's being. Once Avrohom achieved zikna, he had accomplished; his obligation shifted to his son's growth. The difference between Yaakov's "yesh li kol" and Esav's "yesh li rav" emerges as the ability to feel satisfied versus constantly needing more.
Rabbi Zweig opens with a textual difficulty in Parshas Chayei Sarah. The pasuk states "v'Avrohom zaken ba bayamim, vaHashem berach es Avrohom bakol" — Avrohom was old, advanced in days, and Hashem (ה׳) blessed Avrohom with "everything" (bakol). Rashi (רש"י) explains that bakol has the numerical value of 52, equivalent to ben (son), indicating Avrohom had a son whom he needed to marry off. This raises a fundamental halachic question: The Tosefta rules that if both a father and son need to marry, the father is obligated to marry first. Yet here, Avrohom—who had just lost his wife Sarah—marries off his son Yitzchok before remarrying himself, apparently violating this principle. Some suggest that bakol means Avrohom had a daughter, and having already fulfilled the mitzvah (מצוה) of procreation, the halacha (הלכה) no longer applied. However, this interpretation does not fit the simple reading of the text. The Gemara (גמרא) in Bava Metzia states that until Avrohom, there was no zikna (old age) in the world. People would confuse Avrohom and Yitzchok because they looked identical (a miracle Hashem performed so people would know Yitzchok was Avrohom's son). Avrohom davened that there should be a distinction, and Hashem introduced white hair—zikna—into the world. The Maharsha raises a powerful objection: the Torah (תורה) already describes people as zekeinim (old) before this point. Sarah herself said "acharei belosi haysa li edna v'adoni zaken"—after I have withered, shall I have pleasure, and my husband is old? If zikna already existed, what did Avrohom's prayer accomplish? The Maharsha answers that while people aged, their hair did not turn white until Avrohom. However, this answer is difficult: if people visibly aged in other ways (wrinkles, stooped posture), there was already a distinction between young and old. Why did Avrohom need the additional marker of white hair?
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