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Why did Er and Onan die, and how does their sin relate to Yehuda's failure to complete saving Yosef? The shiur develops the profound concept that yibum requires total self-negation—the surviving brother becomes invisible as the widow sees only her first husband reincarnated. This unwillingness to negate oneself for a brother's sake was both Yehuda's sin and his sons' sin. Paradoxically, Er and Onan become the "kupas shel shratzim" (skeletons in the closet) necessary for Mashiach's lineage, ensuring that Melech Dovid—who descends from them through Peretz—would never become arrogant.
Rabbi Zweig opens with a fundamental principle: when Chazal seem to contradict the Torah (תורה)'s explicit explanation of an event, we must identify the deficiency in the Torah's account and reconcile the two sources. The Torah explicitly states that Er and Onan died for their own sins—Er refused to consummate relations with Tamar to preserve her beauty, and Onan spilled his seed because he didn't want children attributed to his deceased brother. Yet the Gemara (גמרא) in Sotah teaches that one who begins a mitzvah (מצוה) and doesn't complete it loses status, buries his wife and children, and brings this teaching from Yehuda—who began saving Yosef by suggesting they sell him rather than kill him, but failed to complete the mitzvah by returning Yosef to Yaakov. The Gemara explicitly connects Er and Onan's deaths to Yehuda's incomplete mitzvah. How can this be reconciled with the Torah's explicit reasons? The Maharsha attempts to resolve this by invoking the principle that children don't die for their father's sins unless they also sin. But Rabbi Zweig challenges this: the principle typically applies when children continue their parent's specific sin, not just any sin. More fundamentally, the entire framework seems forced.
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Parshas Vayeishev (Bereishis 38)
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