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What is the basis for liability in damages—creating a mazik or causing a hezek? The Nimukei Yosef holds one is liable for creating a mazik (failure to guard), while the Rambam (רמב"ם) holds liability stems from the hezek itself. This fundamental chakira drives the analysis of chilasah peshi'ah sofo ones, vessel identity in falling animals (Bava Kamma 22b), and why keren pays only chatzi nezek even when the owner was negligent.
This shiur analyzes the opening Mishna of Bava Kamma (2a), which states there are four avos nezikin: shor, bor, mav'eh, and hever. The Gemara (גמרא) explains that each av is necessary and cannot be derived from the others, yet certain aspects can be extrapolated through gezerah shavah. The shiur opens with a fundamental question: what does the term "arba'os nezikin" actually mean? Rashi (רש"י) and the Nimukei Yosef understand "arba'os nezikin" to mean four types of mazikim—things that cause damage. The Nimukei Yosef explicitly states that "nizikin" means "she'asen nezek," referring to agents of damage. According to this view, the Mishna identifies four categories of damaging entities, and liability arises because one failed to guard these mazikim properly. The core obligation is shemiras ha'lecha—the duty to watch one's property. When one is negligent in this duty, one becomes liable for whatever damage the mazik causes.
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Bava Kamma 2a
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