Vayigash: Internal Commitment vs. External Pressure in Guarantees and Chinuch

Rabbi Zweig examines a fundamental question in Parshas Vayigash: Why did Yaakov accept Yehuda's guarantee to return Binyamin while harshly rejecting Reuven's earlier offer? When Reuven proposed bringing Binyamin to Egypt, he said "You can kill my two sons if I don't return him." Yaakov called him a fool, noting that those children are Yaakov's grandchildren too. Yet when Yehuda later guaranteed Binyamin's return, saying "I will sin to you all the days" (which Rashi (רש"י) explains means exclusion from the Jewish people in this world and the next), Yaakov immediately accepted—despite this being an apparently more severe consequence than the death of grandchildren. The shiur develops a fundamental yesod distinguishing between externally imposed obligations and internally generated commitments. This principle emerges from analyzing why the nations rejected the Torah (תורה) at Sinai. When Esav's descendants heard "Thou shalt not kill" and Yishmael's descendants heard "Thou shalt not steal," they rejected the Torah—yet they were already obligated in these prohibitions under the Noahide laws! The answer is that there is a qualitative difference between a law imposed by God and a law one personally accepts. Under the Noahide framework, God imposed these laws on mankind. At Sinai, God asked: "Do you want to accept the Torah?" The nations said no—not because they weren't already obligated, but because they refused to make it a personal commitment.