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When is a person obligated to pay for benefiting from another's property without causing loss? The shiur analyzes the Gemara (גמרא)'s distinction between cases where the property owner would have rented to others (kayim l'agra) versus when he wouldn't, and explores the Rashba's challenge involving the ba'al aliyah who builds both floors. A fundamental distinction emerges between dinei hana'ah (benefit law) and dinei sechirus (rental law).
The shiur opens with a Rashba's question on the Gemara (גמרא)'s case of a ba'al aliyah (upstairs owner) who uses a beam belonging to the ba'al habayis (ground floor owner). According to Rav Yehuda, this is a case of zeh nehene vezeh lo chaser (one benefits while the other loses nothing) which requires payment due to sechirus (rental). However, the Gemara states that if the ba'al aliyah builds both floors and lives downstairs, he is exempt even according to Rav Yehuda, since it becomes zeh lo nehene (he's not benefiting, as he could move upstairs). The Rashba challenges: granted it's zeh lo nehene, but it's still zeh chaser (causing loss to the owner) - and the halacha (הלכה) generally holds one liable for zeh lo nehene vezeh chaser. How then can the builder be exempt from paying? The shiur then examines Rashi (רש"י)'s understanding of a related Gemara regarding me'ilah (misuse of consecrated property). There appears to be a textual dispute between Rashi and the Ramah regarding who is liable for me'ilah when a gizbar (treasurer) gives a consecrated beam to his friend - whether the gizbar or the recipient is considered mo'el. This leads to a broader analysis of different versions of the Gemara text.
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Bava Kamma 20b-21a
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