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Why doesn't a nidah make her co-wife exempt from yibum, just like achos isha does? The shiur unpacks Tosfot's question: both are in a hekesh, yet only achos isha creates an "exclusion" (neser le'olam) rather than a temporary issur. The distinction hinges on whether the ervah is inherent to the relationship or merely a passing state, with major nafka mina for chalitza.
This Gemara (גמרא) shiur delves into a foundational Tosfot on Yevamos 2a concerning the halachic status of a nidah in the framework of yibum. The central question posed by Tosfot is: why does a nidah not exempt her co-wife (tzara) from yibum the way achos isha does? Both are listed among the arayos in a hekesh, and both render the yavam unable to perform yibum at the time the husband dies. Yet our Mishna makes clear that a nidah does *not* patur her tzara, while achos isha does. Tosfot's inquiry thus probes the conceptual difference between these two prohibitions. Rabbi Zweig begins by questioning whether Tosfot's kasha is even appropriately placed here. The Mishna on daf beis amud alef does not itself say that achos isha is neser le'olam; that fact emerges only later (around daf lamed). If so, how can Tosfot assume at this early stage that achos isha creates a permanent exclusion and then ask why nidah does not do the same? The shiur suggests that Tosfot is articulating a fundamental axiom: *only* when a woman is excluded from yibum (i.e., the zika is severed entirely, not merely obstructed) can she patur her tzara. The proof that she is excluded comes from the fact that her tzara goes free—ervah poter et tzarah. Thus, Tosfot infers backward from the Mishna's silence on nidah that nidah is *not* excluded, and then asks: why not?
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Yevamos 2a
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Why does the Gemara present a kal v'chomer for chuppah making kiddushin based on kesef not being maichel b'terumah, only to reject it? The shiur reveals that even the rejected kal v'chomer establishes a fundamental yesod: kiddushin is a kinyan for ishus (marital relationship), not merely a kinyan in hilchos kinyanim. The second kal v'chomer—from chuppah being gomeres—raises Tosafos's famous question.
Is the kesef used in kiddushin a true kinyan (acquisition), or merely a symbolic means of establishing marriage? The shiur analyzes multiple interpretations of the Gemara's derivation from ki yikach ki'ach mi'Sayeffron, exploring whether marriage constitutes ownership, and develops three fundamental approaches: (1) The Gemara proves ishus is a kinyan, (2) ishus is not a kinyan but uses kinyan-like means, or (3) ishus is a kinyan but the kesef may not be a ma'aseh kinyan. The Rambam's position—calling kesef "midivrei sofrim"—is explained as distinguishing between cross-referencing concepts versus borrowing terminology.
Why does the Mishna alternate between the language of "kinyan" (acquisition) and "kiddushin" (sanctification) when describing marriage? The shiur develops a fundamental distinction: marriage has two separate aspects—a kinyan dimension (ownership) and a kedusha dimension (sanctified relationship). Either aspect can initiate the bond, and understanding this dual nature resolves multiple textual and halachic questions throughout the sugya.
Does kiddushei shetar require a shevah pruta? The Ran presents two approaches to the Rif's position. The shiur develops the Ran's second pshat that shetar kiddushin functions as a hachnah (exchange) rather than a mere kinyan nesina. This reading has profound implications for isuri hana'ah, mechubar, and the relationship between kesef and shetar.
