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Why did Moshe fear Og's merit would protect him in battle—when Og had informed Avrohom about Lot's capture hoping Avrohom would die? The shiur develops the foundational yesod that hakaras hatov depends on the benefit the recipient receives, not the giver's motive. This principle underlies kibud av va'em (parents had children for their own sake) and obligates us to appreciate everyone from whom we benefit—teachers, benefactors, even ancestors—regardless of their intentions.
The shiur opens with the story from Parshas Lech Lecha (14:13) where Og informed Avrohom that his nephew Lot had been captured by the four kings. Rashi (רש"י) in Parshas Chukas and Devarim records that 450 years later, when Klal Yisrael was about to battle Og, Hashem (ה׳) told Moshe "al tira"—don't be afraid—because Moshe feared that Og's merit from informing Avrohom would protect him. The difficulty is stark: Rashi in Lech Lecha itself reveals that Og's motive was entirely nefarious—he hoped Avrohom would be killed in the rescue attempt so that Og could marry Sarah. How could such an act generate any merit at all? Rabbi Zweig distinguishes this case from one where the act itself is harmful (like punching someone, even if the hospital visit incidentally discovers cancer). Here, Og's act—giving Avrohom information he wanted—was objectively beneficial, even though his motive was evil. The principle that emerges is revolutionary: hakaras hatov (gratitude) is owed based on the benefit received, not the giver's intention. As long as the act itself was beneficial and the recipient wanted it, there is an obligation of hakaras hatov, regardless of what the giver was thinking or hoping for.
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Parshas Lech Lecha 14:13
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