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Why does the Gemara (גמרא) ask a contradiction between Truma (where matana al menas lehachzir works) and Mekach u'Memkar (where it doesn't)? The shiur develops that matana al menas lehachzir isn't about value—it's about whether there's a "nisina" (act of giving). From Esrog we learn matana al menas lehachzir can even transfer ownership, fundamentally reframing how this mechanism works in Kidushin, Pidyon Haben, and Kinyan Chalipin.
The shiur analyzes Kiddushin 6b, focusing on the Gemara (גמרא)'s treatment of matana al menas lehachzir (a gift given on condition that it be returned) and the Rambam (רמב"ם)'s seemingly inconsistent presentations of this concept across different halachic contexts. Rabbi Zweig begins by questioning why the Gemara presents the sugya as a contradiction between Rava's positions rather than asking directly how Rava can hold that matana al menas lehachzir doesn't work for Mekach u'Memkar when he holds it does work. The answer reveals the Gemara is teaching us something fundamental about the nature of matana al menas lehachzir itself. The central question is why the Gemara compares Truma (where matana al menas lehachzir is considered shmo matana—a valid gift) to Mekach u'Memkar, Kidushin, and Pidyon Haben (where according to one view it is lo shmo matana—not a valid gift). This comparison seems illogical because in Truma one need only hand over the object without transferring any monetary value, whereas in the other cases one must transfer actual value. Why should Truma be the starting point?
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Kiddushin 6b
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