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Why does dragging a wagon with a rope count as chatzi nezek (tzeroros) while directly pulling it would be nezek shalem (goof)? The shiur develops a fundamental chakira: a stick in your hand extends your body (gufo), but a rope requires continuous force to function—making it simultaneously gufo and koach. This dual status explains the Gemara (גמרא)'s chidush that you pay chatzi nezek even when pulling, and why you're patur on items crushed beneath the wagon.
The Gemara (גמרא) in Bava Kamma 17a introduces the principle that "kol shebe'zov tameh min hazak mimishal nezek shor" (everything that by zav is tameh, in nezikin pays nezek shalem), while "kol shebe'zov tameh min hazak mimishal chatzi nezek" (everything that by zav is tameh through midras, in nezikin pays chatzi nezek). The case of eglah moshechess bekor (a calf dragging a wagon) is used to illustrate chatzi nezek—parallel to tzeroros. The shiur explores why this case is classified as tzeroros (chatzi nezek) rather than nezek shalem, and what the Gemara's comparison to the laws of zav (ritual impurity through a zav's contact) reveals about the nature of koach (force) versus gufo (direct bodily action). Rashi (רש"י) and the Rosh initially appear to present contradictory explanations. Rashi's language suggests that eglah moshechess bekor is considered "ki'gufo dami" (like the body itself), yet the Gemara still categorizes it as tzeroros, which typically involves indirect damage through one's koach. The apparent contradiction deepens when comparing this to the Mishna's ruling on a dalil (bucket) attached to an animal—also classified as tzeroros. The Rav's fundamental question emerges: what distinguishes eglah moshechess (where the animal is pulling the wagon) from dalil (where the bucket is attached to the animal's tail)? Both involve an object attached to the animal causing damage, yet the Gemara treats eglah moshechess as requiring a special chidush from the laws of zav.
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Bava Kamma 17a
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