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Why doesn't a moiser (one who informs on a Jew to gentile authorities) pay with his best property (meitav), despite being liable for damages? The shiur builds a framework through Rashi (רש"י) and the Rambam (רמב"ם): dibur (speech) alone creates no direct hezek, and moiser entails loss of all Jewish rights and privileges rather than being a standard mazik. This explains why meitav doesn't apply and reconciles the Gemara (גמרא) with the halacha (הלכה) that one may kill a moiser.
The shiur analyzes Bava Kamma 5a, focusing on the Gemara (גמרא)'s statement that certain categories—moiser, mafagel, and others—are not included in Rabbi Akiva's list (lo kamari) because they involve dibur (speech) rather than direct action. The central question is why these don't carry the obligation of meitav (payment from one's best property), and how this reconciles with the halacha (הלכה) that a moiser is liable to pay damages and may even be killed. Tosfos learns that the Gemara is not excluding these cases from liability altogether but explaining why they weren't mentioned in the Mishna and Braisa. Rashi (רש"י)'s position is that because these involve dibur and not direct physical damage, they lack the character of regular nezikin. The shiur explores the tension: if knas (fines) normally have no meitav because the victim has already been compensated for the nezek, why would Rabbi Akiva's chiddush—that even knas payments carry meitav—not apply here?
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Bava Kamma 5a
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