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103 shiurim · 22 dafim covered
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12 shiurim
Why doesn't the issur of nidah forever disqualify a yevamah from yibum, just as achos ishtoh does? The shiur analyzes Tosfos's comparison between these two ervos, exploring whether the mechanism that bars yibum is the ervah status itself or the creation of an eshes ach issur, and what distinguishes a relationship-specific issur from a universal one.
Why does tzaras ervah not fall to yibum? The shiur develops a fundamental chakira: does the ervah actively patter the tzara by conferring a status of ervah (the limud of litzarah), or does the tzara simply not fall because when one wife doesn't fall to yibum, the entire bayis lacks zika? This distinction resolves the question of whether eshes ach should patter tzara and explains the shitos of Rashi, Tosafos, and the Rambam.
Why does the Mishna in Yevamos list arayos in its particular order rather than starting with achos isha? The Gemara explores whether the arrangement reflects degrees of issur (chumra), the Torah's textual source (makor), or derived status (asim midrasha). The shiur traces the Gemara's progression through these answers and examines whether the underlying din of yibum's prohibition stems from the issur karas or the absence of tofes kiddushin.
Why are witnesses who testify falsely about the kavana (intent) of an accidental killing not subject to the standard rule of eidim zomemim? The shiur analyzes Tosfos' two approaches: either their punishment comes through lo sa'aseh rather than the kazama framework, or they receive the punishment the original party would have gotten (sreifa or chenek depending on circumstances). The discussion explores when kavana requires formal testimony versus when it can be inferred.
Why can't a katana (minor) whose husband dies fall to yibum if she might become an aylonis (barren woman)? Tosfos raises the problem: if the husband accepted her as an aylonis (kibeil aleha), the kedushin may be valid, creating a safek whether the yevama is truly eshes achiv. The shiur examines when such acceptance (kabbalah) must occur, how mekach ta'os applies when discovering she is an aylonis, and whether this creates a double-doubt (sfeik sfeika) permitting yibum.
Why does Rebbe hold that safek safek permits a woman for yibum, whereas rov does not? The shiur develops a fundamental distinction: safek safek involves no actual question—both paths lead to heter—whereas rov resolves an actual doubt. Rabbi Zweig shows that Rebbe permits only when there is no genuine sha'alah to answer, distinguishing this from mi'ut d'mi'ut.
Why doesn't a nidah remain forbidden to yibum forever, just like achos isha? The shiur unpacks Tosafot's difficult question: whether the issur that blocks yibum at the moment of nefilah creates a permanent eishes ach status. The core chiddush: only an issur specific to the yavam creates an eishes ach, not a blanket issur like nidah.
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.
Why doesn't a niddah fall into the category of arayos that are excluded from yibum? The shiur analyzes Tosfos and the Rosh, distinguishing between exclusion from yibum (like arayos) versus prohibition of yibum (like chayavei lavin). An issur that is omed to go off—such as niddah—creates neither exclusion nor nesirah, because it defines a temporary state rather than the essence of the woman.
Why isn't bito she'hi bas ishto considered ein ma'alin min hadin? The shiur develops a fundamental chakira in Tosafos: when two forbidden relationships combine, do they merely coexist quantitatively, or do they coalesce into a qualitatively new entity? The answer determines whether one is liable once or twice, and distinguishes the Rambam from the Raavad.
Why does an asei override only a lav she'einah shavah bachol? The shiur develops the principle that when neither commandment is absolute—both are einah shavah bachol—the Torah employs hutra (the lav was never said here), not dehuyya (overriding). This explains why the Gemara cannot extrapolate from metzora to general asei docheh lav, and resolves multiple difficulties in Tosfos regarding yibum.
Why does tzaras tzarah—the co-wife of a co-wife—require its own pasuk when it should follow automatically from tzaras ervah? The shiur opens the gemara's core problem: once a woman who is tzaras ervah marries a second brother, she becomes an eshes ach shelo b'makom mitzvah, so her tzarah should be patur on that basis alone. Rav Yehuda Keivel's question and multiple Rishonim (Rashi, Tosafos) are unpacked at length.
1 shiur
3 shiurim
If someone is exempt from yibum, are they automatically exempt from chalitza? The shiur analyzes two competing understandings: (1) chalitza exists only to remove the zika (bond) created by yibum, making it dependent; or (2) chalitza is an independent mitzvah that exists alongside yibum as part of one unified obligation, such that kol ha'oleh l'yibum oleh l'chalitza—wherever yibum applies, chalitza applies too.
8 shiurim
Can a yevamah be coerced to perform yibum with a mukeh shechin yavam? The Gemara derives from "lo techasum shor bedisho" that she cannot be muzzled. The shiur contrasts the Rambam's approach—treating yibum like regular ishus where the woman is a principle—with the Rashba and Meiri who see yibum as potentially coercive (bal korcha), treating the woman more as an object of the mitzvah.
3 shiurim
The Gemara asks: from where do we know that juxtaposed verses (semuchim) teach a halachic relationship? The shiur examines multiple approaches in the Rishonim—Rashi, Rambam, Tosafot, and Rashba—to how semuchim work in the case of Yevamos 4a, where lo sachsom shor ("do not muzzle an ox") is adjacent to the laws of yibum. Does juxtaposition mean reconciling conflicting laws, or does it mean absorbing one law into the other?
3 shiurim
How do we know tzitzis permits shatnez both ways—wool tzitzis on a linen garment and linen tzitzis on a wool garment? The shiur analyzes Rava's contradiction between "min kanaf" and "semer pishtim" and explores whether the Gemara derives this through semuchin (juxtaposition) between the shatnez prohibition and the tzitzis commandment or through a migu argument.
15 shiurim
Why does an eseh only override a lo sa'aseh she'eino shaveh bakol (not universally applicable) and not one shaveh bakol (universally applicable)? The shiur analyzes Tosfot's approach that when eseh docheh lo sa'aseh works, it's because the eseh is more chamur (stringent) than the prohibition. The analysis explores whether lo sa'aseh v'eseh means the eseh fortifies the prohibition, or they remain separate.
7 shiurim
Why does a positive commandment (aseh) override a prohibition (lo taaseh)? The shiur analyzes the Gemara's attempt to derive this principle from milah, Pesach, and korban tamid overriding Shabbos. Each suggested source faces a refutation (pircha), revealing fundamental questions: Is it because the aseh is "stronger," or is there an independent rule that a lo taaseh was given conditionally, subject to any prior aseh?
6 shiurim
What does the mitzvah of *mora mikdash* (reverence for the Sanctuary) require? The shiur analyzes two approaches in Tosafos: one treats it as a positive obligation (like treating the Mikdash as an object of awe), the other as a prohibition against disrespect. The connection to Shabbos through *hekesh* reveals whether reverence stems from the building itself or from Hashem's presence manifest there.
5 shiurim
When one brother performs chalitzah, does the prohibition of eishes ach return on the surviving woman? The shiur develops the fundamental machlokes between Rabbi Yochanan and Reish Lakish over whether yibum creates a zikah (connection) to each brother individually or to the bayis as a collective unit. This distinction determines whether chalitzah by one brother affects the status of all the brothers.
2 shiurim
Why does the Gemara say a murderer is pulled away from the altar even during avodah? Rashi's reading that the kohen "wants to do avodah" seems inconsistent with the logic that retzichah overrides avodah. The shiur develops a fundamental yesod: beis din's execution is not a bitul (nullification) of mitzvos but a kiyum (fulfillment) of what must be done, and therefore not a chillul Shabbos.
2 shiurim
The shiur analyzes Yevamos 7b on whether partial entry into the Temple (biya b'miktzas) constitutes a full entry or merely contact. Two models emerge: partial entry redefines what "entry" means (and is thus explicit in the Torah), or it establishes a separate halacha of contact (negiah). The Gemara's principle of "kol d'ishtri ishtri" depends on which issur was established first and whether one issur builds upon another.
1 shiur
5 shiurim
What creates the din of tumah that exempts a sotah from yibum and chalitza? The shiur analyzes whether tumah stems from removing the woman from the husband's reshus (davar she'b'ervah) or merely from her becoming assur. This chakira resolves apparent contradictions between sugyos in Yevamos and Sotah regarding Eishes Kohen shenensa, and explains the Rambam's rulings on eid echad b'tumah and sotah safeik.
5 shiurim
When a man remarries his divorced wife after she married another, does her tzara (co-wife) need chalitza or is she permitted to yibum? The shiur analyzes Yevamos 11b, examining the machlokes between Rashi and Tosafot on whether tumah k'sivah karayas exempts the machzir gerushto herself from chalitza, and whether the tzara is considered "kamosa" (like her). A fundamental tension emerges: how can an ervah who requires chalitza still exempt her tzara from yibum?
4 shiurim
The Gemara questions why different Jewish communities read the Megillah on different days without violating lo titgodedu (creating divisions). The shiur analyzes whether the prohibition applies when there are legitimate reasons for different practices, whether it governs rabbinic legislation, and how the universal nature of the Purim salvation relates to varied local observances.
1 shiur
5 shiurim
Does lo titgodedu apply when different communities pasken differently, or only when their observable practices diverge within one city? The shiur develops the fundamental distinction: if lo titgodedu governs psak halacha, two cities may not differ; if it governs hanhaga (observable practice), two cities may differ, but one city may not. This chakira illuminates the Gemara's shift from amud beis to amud alef and has major implications for whether minhagim trigger lo titgodedu.
2 shiurim
The shiur analyzes the dispute between Rebbe Yochanan and Reish Lakish regarding yibum with a pregnant yevama. When biya or chalitza is performed with a muberet, is it considered valid (shmo biya/chalitza) or not (lo shmo)? The Gemara explores what "yekayem" means—maintain the status quo or perform a new action—and whether remarriage, chalitza, or get is required after the birth reveals she was already pregnant.
2 shiurim
Can a statistical majority (rov) permit a yevama to remarry when we don't know if she gave birth? The shiur develops a fundamental distinction: rov can say "there is no question" but cannot resolve an actual question. When a woman's status requires testimony (eidim) to change—as in yibum—a rov hatoli b'meisa (majority based on an assumed action) cannot overturn the existing chazaka.
3 shiurim
May a metzora who is a tevul yom from keri enter Machaneh Leviyah to undergo tahara? The shiur analyzes the Gemara's principle of "hoyal v'ishri ishri" and Ula's concept that "biah b'miktzas shmo biah" (partial entry is considered entry). The Reb Chaim's fundamental chakira between the issur of being in the Mikdash versus the issur of entering it provides a new lens on multiple sugyos.
1 shiur
7 shiurim — daf not yet assigned
Why does the Mishna use "patur" (exempt) instead of "asur" (forbidden) when describing ervah's exemption from yibum? The shiur analyzes the Gemara's dialectic: "patur" might misleadingly suggest voluntary yibum is permitted, while "asur" might wrongly imply she's forbidden even outside the mitzvah context. The resolution hinges on which formulation better captures that she's excluded *because* she's an ervah, not merely exempt from a mitzvah.
When does an asei override a lo taaseh v'asei? The shiur distinguishes between issur asei (passive obligation) and mitzvas asei (active obligation), showing that the principle of asei docheh lo taaseh applies differently to each. The Rambam's divergent psakim in Hilchos Shabbos and Hilchos Yom Tov reflect this fundamental chakira.
Why does the Torah juxtapose shatnez and tzitzis? The shiur analyzes Tosafot's understanding of smucha (juxtaposition), exploring whether it creates a complete fusion of parshiyot or merely a reconciliation. Through detailed analysis of shatnez-tzitzis, Shabbos, and Pesach, Rabbi Zweig develops the conceptual mechanics of how smucha works compared to hekesh.
When wearing shatnez is forbidden—does it require kavana for warmth (hana'as chimu), mere intention to wear (kavana levisha), or any amount of benefit? The shiur develops multiple ways to reconcile the two pesukim (lo ya'aleh and lo tilbash), exploring whether shatnez needs intent for warmth, actual warmth, or just the act of wearing, and whether wearing a garment as a shawl differs halachically from wearing it properly.
When does an asei override a lo taaseh? The shiur analyzes whether asei docheh lo taaseh means the asei remains obligatory but circumstances prevent fulfillment, whether it's a psak halacha of shev ve'al taaseh, or whether the asei was never given where the lo taaseh applies. The Rivvo and Rabbeinu Nissim's positions are explored through Yevamos 5a and parallel sugyos in Shabbos, Chulin, and Zevachim.
Why does the Gemara's proof that asei docheh lo sa'aseh employ different types of pirchos when learning from one source versus from two? The shiur develops a three-tier chakira: chad me'chad means the asei itself is stronger than the lo sa'aseh; ma'ad sa'ad (two sources) means the lo sa'aseh was restricted from the start; and learning from three means the din is weaker still—less than fully reasoned, more halachic necessity.
Can an eishes ish who is forbidden to the yavam through a conditional neder (baalas tenaim) exempt her tzarah from yibum? The shiur analyzes Tosfos Yevamos 6a and 17a, exploring whether zika l'yibum depends on the moment of nefilah or on ongoing status, and unpacking the machlokes Ramban-Rashba on whether an ervah must be present at nefilah to exempt the tzarah.
Why does the Gemara cite pesukim about Shabbos violations when the core question is executing someone on Shabbos? The shiur works through Rashi's approach to understanding what "lo sa'aseh kol melacha" means—whether it prohibits each melacha individually or requires doing all thirty-nine melachos together to violate Shabbos. The discussion addresses why the Gemara treats havara as only a lav and explores the concept of davar she'yatza min haklal.
How can the pasuk "lo savaru eish" teach both that one is chayav for a single melacha and that thirty-nine melachos yield thirty-nine korbanos? The shiur develops a yesod through Rashi, Tosfos, the Rashba, and the Ramban: a pasuk can generate multiple limudim even when yotze mi-klal, provided the new insight emerges as a byproduct of the primary din.
When a mechusar kippurim enters the Beis Hamikdash, does the Torah permit the issur of tuma or remove the tuma status entirely? Two approaches to the Gemara's proof from cholel be'ishur ishur emerge: either the Torah takes away tuma status (making a baal keri also permissible), or the Torah permits the issur itself (meaning more tuma doesn't matter). The distinction shapes how cholel works for eishes ach/achos isha.
What is the nature of the prohibition when a wife becomes forbidden to her husband—an issur ishus (prohibition affecting the marriage) or an issur bia (prohibition of relations)? The shiur analyzes the Rambam's position that malkus for sotah vadai is d'rabanan while sotah safek receives malkus mardus, revealing a fundamental chakira: sotah vadai creates an issur ishus requiring two witnesses (davar sheb'ervah), while other prohibitions like eishes kohen shenensa create only an issur bia, requiring chalitzah but not full kares ishus.
Does a sotah safek (suspected adulteress without proof) require chalitza? The shiur analyzes Yevamos 11b, contrasting Rav's position with Rav Ashi's, exploring whether safek k'vadai (doubt treated as certainty) means presumption of relations or that intimacy itself constitutes tumah. Nafka minas include mamzerus, malkos, and the mechanism of issur.
May a woman use contraception when pregnancy poses danger? The Gemara discusses three women who may use a moch (contraceptive): a minor, a pregnant woman, and a nursing mother. Rabbi Meir and the Rabbanan debate whether contraception is obligatory or permissible, invoking "shomer p'sa'im Hashem." The shiur explores the Rambam's psak, Rashi and Tosafot's dispute over timing, and the broader implications for safek sakana, smoking, and health risks.
What makes some custom differences a violation of lo sasgodu while others remain permissible minhagim? The shiur analyzes Yevamos 13b's discussion of Megillah reading times to develop a fundamental chakira: lo sasgodu applies when one community holds another's practice is prohibited, not merely when they follow different customs. This distinction reshapes how we understand legitimate diversity in Jewish practice.
Can a yevama who is pregnant receive chalitza, or must we wait until she gives birth? The Gemara presents a fundamental dispute between Rabbi Yochanan and Reish Lakish over whether we retroactively apply knowledge (iglo milson mafreya) when the child is later miscarried. The shiur analyzes multiple approaches in Tosafos and Nemuke Yosef regarding what determines the validity of chalitza—the embryo's current state or its ultimate fate.
Can a yevama perform chalitzah during the nine months after her husband's death, when she might be pregnant? The Gemara distinguishes between cases where a rov (statistical probability) clarifies the chalitzah's validity versus cases of true uncertainty. When the rov indicates she's pregnant, chalitzah is permitted; when her status is genuinely uncertain, rabbinic decree prohibits it to prevent confusion about chalitzah's effectiveness.
Why is kalah b'lo bracha a more stringent prohibition than muberis chaveiro, to the point that one issur cannot serve as a shemirah for the other? The shiur explores whether the distinction lies in the nature of gezeirah versus issur, in the special stringency of sakana (danger to life), or in the conceptual difference between a prohibition and a requirement to perform an action first.
