Daf Yomi · Expert – Beit Midrash Analysis · Standard
Chullin 70
Sugya Map
The sugya of Chullin 70a serves as the locus classicus for analyzing the mechanical and metaphysical boundaries of birth (leidah) in Jewish law, specifically concerning the consecration of a firstborn animal (kedushat bechor). The talmudic discourse transitions from a conceptual debate on the timing of consecration to physical and anatomical inquiries regarding majorities, interpositions (chatzitzot), and the definition of a womb-opening (peter rechem).
[The Womb: Peter Rechem]
│
┌────────────────┴────────────────┐
▼ ▼
[Temporal Consecration] [Anatomical Birth]
"When does Kedushah land?" "What constitutes emergence?"
│ │ │ │
▼ ▼ ▼ ▼
[Retroactive] [Proactive] [Majority] [Interposition]
(Rav Huna) (Rabba) (Rava's Dilemma) (Siv/Weasel/Two Wombs)
- The Core Issue: Does the consecration of a firstborn animal occur retroactively (lemafre'a) upon the completion of the birth process, or does it take effect proactively (mikan u'lehaba) at the moment the threshold of birth is crossed?
- The Anatomical Dilemmas:
- Does a majority (rov) of an individual limb project its status to the rest of that limb, thereby completing the required majority of the entire fetus (rov ubar)?
- What constitutes an interposition (chatzitzah) during birth? Does a physical barrier (palm bast, a robe, a foreign afterbirth) or an unnatural delivery mechanism (a weasel swallowing and vomiting the fetus; pressing two wombs together) invalidate the halakhic "opening of the womb" (peter rechem)?
- Does the airspace of the womb (avir rechem) consecrate, or does physical contact with the vaginal walls (maga'at rechem) do so?
- The Nafka Minot (Halakhic Ramifications):
- The status of limbs severed and cast away during a protracted, difficult birth (mechattech u'mashlich).
- The validity of a sale to a gentile executed mid-birth (after a third of the fetus emerged).
- The status of subsequent offspring if the firstborn emerged through a foreign medium.
- The susceptibility of a dead fetus in utero to transmit carcass impurity (tumat nevelah).
- Primary Sources: Exodus 13:2, Leviticus 5:2, Leviticus 11:39, Mishnah Chullin 4:3 (which appears on Chullin 68a and is analyzed on Chullin 70a), Chullin 70a-70b.
Full Experience in the App
Listen. Chat. Go deeper.
Audio playback, interactive chevruta, Hebrew tools, and every daily learning track — only in Derekh Learning.
Text Snapshot
The Gemara on Chullin 70a opens with a dialectical defense of the necessity of the dispute between Rabba and Rav Huna, followed by a rigorous challenge to Rav Huna from the Mishnah:
וְאִי אִתְּמַר בְּהָא, בְּהָא קָאָמַר רַבָּה: מִכָּאן וּלְהַבָּא קָדוֹשׁ – דְּאִי אָמְרַתְּ ״לְמַפְרֵעַ״, קוּלָא הוּא, דְּלָא קָדֵישׁ. אֲבָל בְּהָא – אֵימָא מוֹדֵי לֵיהּ לְרַב הוּנָא. צְרִיכָא.
"And if their dispute was stated only with regard to that case [where one-third emerged through the wall of the womb], one might have thought it is only in that case that Rabba says the animal is consecrated from that point forward [proactively], as that results in a stringency... But in this case [sale to a gentile], one might say that Rabba concedes to Rav Huna. Therefore, it was necessary..."[^1]
The Gemara then challenges Rav Huna's theory of retroactive consecration (lemafre'a kadosh) from the Mishnah:
תָּא שְׁמַע: בְּהֵמָה הַמְּקַשָּׁה לֵילֵד, מְחַתֵּךְ אֵבֶר אֵבֶר וּמַשְׁלִיךְ לַכְּלָבִים. יָצָא רוּבּוֹ – הֲרֵי זֶה יִקָּבֵר, וּפְטוּרָה מִן הַבְּכוֹרָה.
"Come and hear: If an animal that was giving birth to a firstborn was encountering difficulty, one may cut up the fetus limb by limb and cast it to the dogs. If a majority of it emerged, it must be buried..."[^2]
Linguistic Nuance
The phrase "מְחַתֵּךְ אֵבֶר אֵבֶר וּמַשְׁלִיךְ לַכְּלָבִים" (cutting limb by limb and casting to the dogs) serves as a critical pivot. The repetitive double-phrasing of "אֵבֶר אֵבֶר" (limb [by] limb) implies a sequential, continuous action. The Gemara exploits this to distinguish between two cases:
- Mechattech u'mashlich (cutting and casting immediately): Where each limb is disposed of before the next is severed.
- Mechattech u'maniach (cutting and leaving): Where the limbs remain in the vicinity.
The pronoun "רוּבּוֹ" (its majority) in "יָצָא רוּבּוֹ" (its majority emerged) is also subjected to intense scrutiny. Does "majority" mean the literal majority of the physical fetus (rubo shel ubar), or does it refer to a composite majority achieved by joining the majority of a single limb (rov eiver) to the half of the fetus that has already emerged? The grammatical elasticity of "majority" in Chazal's lexicon oscillates between a quantitative physical volume and a qualitative halakhic status.
Readings
1. Rashi vs. Rabbeinu Gershom: The Mechanics of Sale Mid-Birth
The dispute between Rabba and Rav Huna hinges on whether kedushat bechor is a temporal process that culminates at birth but is rooted in the entire emergence, or whether it is a discrete point-in-time transformation.
[Rabba: Proactive Consecration]
Birth Sequence: [ 1/3 emerged ] ───► [ Sale to Gentile ] ───► [ 2/3 emerged ]
Holiness Status: (Not yet holy) (Sale is valid) (No Kedushah takes effect)
[Rav Huna: Retroactive Consecration]
Birth Sequence: [ 1/3 emerged ] ───► [ Sale to Gentile ] ───► [ 2/3 emerged ]
Holiness Status: (Pending) (Sale is voided) (Holy retroactively from 1/3)
Rashi clarifies that the core of the dispute regarding a sale to a gentile mid-birth lies in the status of the fetus during the transition[^3]:
- Rashi's View: According to Rabba, who holds mikan u'lehaba kadosh (consecrated from now on), when the first third emerges, it possesses no sanctity. When the owner sells the remaining two-thirds to a gentile before they emerge, the sale is fully valid. Thus, when the fetus finally completes its birth, it is partially owned by a gentile, which exempts it from the firstborn status. Conversely, according to Rav Huna, who holds lemafre'a kadosh (consecrated retroactively), the final emergence of the majority retroactively consecrates the fetus from the very first moment of its initial emergence. Consequently, the mid-birth sale to the gentile was a sale of an already-consecrated object (hekdesh), which is legally void, leaving the animal fully holy.
- Rabbeinu Gershom's View: Rabbeinu Gershom frames the nafka mina of Rabba and Rav Huna with a focus on stringency versus leniency[^4]. He notes that the Gemara must present both the case of the Caesarean section (yotze dopen) and the sale to a gentile. In the Caesarean case (where one-third emerged through the flank and two-thirds through the womb), Rabba's proactive view is a chumra (stringency), because by declaring the womb-emergence as the sole trigger for holiness, he obligates the offspring in bechorah. In the case of the sale to a gentile, however, Rabba’s proactive view is a kula (leniency), because it permits the sale to strip the fetus of its holiness. Rabbeinu Gershom highlights that Rabba's metaphysical consistency—that holiness cannot land retroactively—remains unyielding, whether it yields a lenient or stringent outcome.
2. Tosafot: The Severed Limb Paradox (Machettech u'Maniach)
The Gemara raises a challenge against Rav Huna: If lemafre'a kadosh is true, then if one cuts up a fetus limb by limb and leaves the pieces nearby (machettech u'maniach), once the majority of the fetus emerges, all those previously severed limbs should retroactively become holy and require burial.
Tosafot grapple with this definition of majority[^5]:
- The Tosafot Chiddush: Tosafot point out that if the limbs were cut and left, they cannot retroactively acquire kedushat bechor unless they are considered part of the "birth" when the majority eventually emerges. If the limbs are completely detached, how can they join the rest of the body to form a "majority of the fetus" that requires burial?
- Tosafot establish that machettech u'maniach creates a unique halakhic status where the severed parts, by virtue of their physical proximity and common origin, are treated as "unification in suspension" (kayam l'iztarfe). The retroactive holiness of Rav Huna does not merely apply to the currently connected body; it travels back in time to infect any part of the original cheftza (object) of the fetus that remains within the owner's domain. If the limbs were cast to the dogs (mashlich), however, they are halakhically lost and exit the owner's domain, cutting off the energetic link of retroactive kedushah.
3. The Rambam’s Codification: Dor Revi’i’s Conceptual Resolution
The codification of this sugya by the Rambam presents a famous challenge. The Rambam rules in favor of Rav Huna—that lemafre'a kadosh (retroactive consecration occurs)[^6]—and consequently rules that if one cuts up the fetus and leaves the limbs, they must be buried once the majority emerges. This contradicts the standard talmudic heuristic that when Rabba and Rav Huna dispute a matter, the halacha follows Rabba.
[Talmudic Heuristic] [Rambam's Codification]
Rabba vs. Rav Huna ──► Rabba Rabba vs. Rav Huna ──► Rav Huna
│
┌──────────────┴──────────────┐
▼ ▼
[Dor Revi'i's Analysis] [S'tam Gemara's Alignment]
R' Huna's view is the S'tam Gemara assumes R' Huna
basis for Rava's query to resolve Rava's dilemma
The Dor Revi'i (R' Moshe Shmuel Glasner) offers a brilliant analysis of Rashi and the Rambam on this point[^7]:
- The Dor Revi'i's Chiddush: Why does the Rambam rule like Rav Huna? The Dor Revi'i points to the structure of the sugya. The Gemara later introduces Rava’s dilemma: "Does one follow the majority with regard to limbs or not?" The Gemara attempts to resolve Rava’s dilemma by citing the Mishnah's clause: "If a majority of it emerged, it must be buried."
- The Dor Revi'i notes that according to Rashi, this proof is rejected or reinterpreted by the S'tam Gemara (anonymous voice of the Talmud) as a mere forced resolution (shinuy b'alma)[^8]. However, the Rambam understands that the S'tam Gemara’s willingness to use the Mishnah to resolve Rava’s query is structurally predicated on Rav Huna's premise. Because the subsequent amoraim (Rava, Rav Acha, Mar bar Rav Ashi) construct their dilemmas regarding the womb's parameters under the assumption of Rav Huna's retroactive model, the S'tam Gemara itself has effectively adopted Rav Huna's view as normative. The Rambam, tracking the deep current of the redactor's assumptions rather than superficial heuristics, correctly rules like Rav Huna.
4. Rav Shimon Shkop: Recursive Majorities and the Cheftza of Birth
In his Sha'arei Yosher, Rav Shimon Shkop analyzes Rava’s dilemma: "Does one follow the majority with regard to limbs or does one not?"[^9]
[Rava's Dilemma: Limb vs. Fetus]
│
┌────────────────┴────────────────┐
▼ ▼
[Physical Reduction] [Halakhic Expansion]
Limb is a subset of fetus. "Rov eiver k'kulo" applies first.
It cannot override the Limb is considered fully emerged,
fetus's physical majority. completing the fetus's majority.
- Rav Shimon's Analysis: If half of the fetus has emerged, and that half contains the majority of an additional limb (whose remaining minority is inside the womb), does the rule of rubo k'kulo (the majority is like the whole) apply recursively? That is, do we first apply rubo k'kulo to the limb (making the entire limb halakhically "emerged"), and then use that halakhically emerged limb to push the fetus's emerged portion over the 50% threshold?
- Rav Shimon distinguishes between two types of rubo k'kulo:
- Quantitative Representation: Where the majority represents the physical whole for functional purposes (e.g., eating a majority of an olive-sized volume of matzah).
- Qualitative Redefinition: Where the majority fundamentally redefines the status of the cheftza (e.g., a majority of a vessel determines its purity status).
- In Chullin 70a, Rava is questioning whether rov eiver (majority of a limb) can serve as a qualitative redefinition of "emergence" (yetziah). If we say rubo k'kulo applies to the limb, it is not merely that we pretend the limb is outside; rather, the halakhic reality of "birth" recognizes the limb as having crossed the threshold. If the limb has crossed, the physical boundary of the womb has been breached by a majority of the fetus's limbs, satisfying the requirement of peter rechem.
Friction
The Core Kushya: The Metaphysical Disconnect of Severed Limbs
The most formidable challenge in this sugya is the mechanics of machettech u'maniach (cutting and leaving) under Rav Huna's retroactive consecration (lemafre'a kadosh).
The Gemara states:
"But if one cuts and leaves the limbs until a majority has emerged, it is regarded as though a majority of it emerged at one time, and so it must be buried."[^10]
The Kushya: How can a limb that was severed prior to the emergence of the majority be consecrated? At the moment of the limb's severance, there was no "birth" (as a majority of the fetus had not yet emerged). Therefore, the severed limb was merely ubar (a fetus), which is considered "the thigh of its mother" (ubar yerech imo)[^11]. It possessed no independent kedushat bechor.
When the remaining majority of the fetus subsequently emerges, how can its birth retroactively consecrate a limb that is already physically detached and independent? A severed limb is no longer part of the animal; it is a separate entity sitting on the ground. How can the "opening of the womb" (peter rechem) by the rest of the fetus cast a net of holiness backward in time to capture a piece of meat that is no longer connected to the womb or the fetus?
[The Severed Limb Paradox]
T1: Limb A is severed ──► Limb A is on the floor (No holiness, "thigh of mother")
T2: Remaining 2/3 of fetus emerges (Womb is opened)
Question: How does the womb-opening at T2 retroactively sanctify the detached Limb A at T1?
The Terutz (The Brisker/Rabbi Chaim Soloveitchik Approach)
To resolve this, we must employ the classic distinction of Rabbi Chaim Soloveitchik regarding the nature of kedushat bechor[^12]. Is kedushat bechor an inherent holiness of the animal's physical body (kedushat haguf of the fetus), or is it a status generated by the womb's transition (kedushat peter rechem)?
If it were merely kedushat haguf of the fetus, then indeed, once a limb is severed, it is no longer part of the cheftza of the fetus and cannot become holy.
However, the Torah does not write "consecrate the firstborn animal"; it writes:
"Sanctify to Me every firstborn, whatever opens the womb (peter kol rechem)..."[^13]
The holiness is a metaphysical charge that is applied to whatever passed through the womb during the opening event.
- The Resolution: The birth of a firstborn is not a single instantaneous point; it is a cumulative process. The "opening of the womb" (petichat harechem) begins with the emergence of the first limb and concludes with the emergence of the majority.
- According to Rav Huna, lemafre'a kadosh means that the entire sequence of birth is unified. The moment the majority emerges, it retroactively defines the entire sequence—from the emergence of the first limb onward—as a single, continuous "opening of the womb."
- Therefore, even though Limb A was physically severed at Time 1, it was severed within the temporal window of the womb-opening sequence. Because it was part of the entity that initiated the petichah, the ultimate completion of that petichah at Time 2 retroactively sanctifies everything that participated in the sequence.
- If the limb was cast to the dogs (mechattech u'mashlich), the owner has actively removed it from the halakhic arena of the birth sequence, nullifying its connection. But if it was left (mechattech u'maniach), it remains tethered to the birth event, and the retroactive wave of kedushah washes over it.
Alternate Terutz: The Kehillat Yaakov (Steipler Gaon)
The Steipler Gaon (Kehillat Yaakov, Chullin §23) offers an alternative, highly precise structural resolution:
- He argues that we do not need to rely on temporal retroactive action. Rather, the entire fetus—including its limbs—is designated as "holy from the womb" (kadosh me-rechem). The physical emergence of the majority is not the creator of the holiness, but rather the revealer (giluuy milta) that this fetus was indeed the valid firstborn.
- When the limb is severed and left, it carries a latent, potential holiness. It is not "profane" (chulin); it is "consecrated in suspense" (kadosh v'omed). Once the majority emerges, the condition is met, the potentiality is realized, and the latent holiness of the severed limb crystallizes into active kedushat bechor.
Intertext
The talmudic dilemmas of Chullin 70a do not exist in a vacuum; they interact dynamically with biblical verses, the codifications of the Shulchan Aruch, and subsequent responsa literature.
Tanakh: The Dual Terminology of Firstborn Consecration
The conceptual tension in our sugya is rooted in a linguistic duality in the Torah itself. In Exodus 13:2, the Torah writes:
קַדֶּשׁ־לִ֨י כָל־בְּכ֜וֹר פֶּ֤טֶר כָּל־רֶ֙חֶם֙ בִּבְנֵ֣י יִשְׂרָאֵ֔ל בָּאָדָ֖ם וּבַבְּהֵמָ֑ה לִ֖י הֽוּא׃
"Sanctify to Me every firstborn, whatever opens the womb among the children of Israel, both of man and of beast; it is Mine."
Here, the Torah merges two distinct concepts:
- בְּכוֹר (Bechor - Firstborn): A genealogical/familial status. This is a person or animal that is the "beginning of strength" (reishit ono), focusing on the identity of the offspring.
- פֶּטֶר רֶחֶם (Peter Rechem - Womb-Opener): A mechanical/anatomical status. This focuses on the physical passage through the mother's womb.
The Gemara's dilemmas on Chullin 70a directly test the boundaries of these two definitions:
[The Tension of Firstborn Sanctity]
│
┌──────────────────┴──────────────────┐
▼ ▼
[Genealogical: Bechor] [Mechanical: Peter Rechem]
Focus: Identity of fetus. Focus: Passage through womb.
(Relevant to: Kal Vachomer, (Relevant to: Chatzitzah, Weasel,
Tumat Nevelah in utero) Two Wombs, Airspace vs. Contact)
When Rava asks about wrapping the fetus in palm bast (siv) or a robe, or when Rav Acha asks whether the airspace of the womb consecrates (avir rechem) or only physical contact (maga'at rechem), they are probing the limits of peter rechem. If the essence of the mitzvah is the physical friction and passage through the maternal tissue, then an interposition (chatzitzah) or lack of contact (due to thinned or widened walls) invalidates the holiness. If the essence is simply being the first offspring to exit the maternal domain (bechor), then these physical anomalies are irrelevant.
Shulchan Aruch: Codification of the Womb Dilemmas
The Shulchan Aruch Shulchan Aruch, Yoreh Deah 315:1-3 codifies these talmudic doubts as practical law:
הַמּוֹצִיא בֶּן פְּקוּעָה דֶּרֶךְ דֹּפֶן, אוֹ שֶׁנֶּחְתַּךְ אֵבֶר אֵבֶר... וְכֵן הַבְּעָיוֹת שֶׁלֹּא נִפְשְׁטוּ בַּגְּמָרָא, כְּגוֹן הַכּוֹרֵךְ בְּסִיב אוֹ בְּבֶגֶד, אוֹ שֶׁבְּלָעַתּוּ חֻלְדָּה... הֲרֵי זֶה סְפֵק בְּכוֹר.
"One who extracts a fetus via the flank (Caesarean), or if it was cut limb by limb... and likewise the dilemmas that were not resolved in the Gemara, such as wrapping it in bast or a cloth, or if a weasel swallowed it... behold, this is a doubtful firstborn (safek bechor)."[^14]
Because these dilemmas ended in a talmudic tie ("תֵּיקוּ" - Teku)[^15], the Shulchan Aruch applies the rules of doubtful consecration: the animal must be kept in a state of suspended sanctity. It may not be sheared or worked (assur b'giza v'avoda), but the Kohen cannot claim it from the Israelite owner without absolute proof, in accordance with the civil law principle: "He who extracts from his fellow bears the burden of proof" (hamotzi mechavero alav hareiyah)[^16].
Psak/Practice
The unresolved dilemmas of Chullin 70a yield a fascinating meta-psak heuristic in contemporary halachic practice. When the Gemara leaves a physical or mechanical question unresolved (teku), it forces the halakhic system to operate in a state of dual-track reality:
[Teku: Safek Bechor]
│
┌────────────────────┴────────────────────┐
▼ ▼
[Ritual Track: Chumra] [Monetary Track: Kula]
Assur b'Giza v'Avoda Owner retains possession.
(Forbidden to shear/work) Kohen cannot extract animal.
The Safek Bechor Heuristic
In classic sacrificial law, a safek (doubt) usually requires a guilt-offering of suspense (asham talui) or leads to stringency. In the case of bechor, which is owned by the Kohen but sanctified from birth, the safek splits down the middle:
- The Monetary Dimension (Mamon): The Israelite owner retains the animal. The Kohen has no legal claim to the physical beast because of hamotzi mechavero alav hareiyah.
- The Issur Dimension (Prohibitions): The animal retains its intrinsic holiness (kedushat guf). It cannot be slaughtered outside the Temple unless it develops a permanent blemish (mum kavua), and it remains strictly forbidden for shearing and work.
Modern Application: The Sale of the Womb (Mechirat Rechem)
In modern agricultural settings, particularly in Israel, the birth of a male firstborn animal presents a severe economic challenge, as it cannot be utilized for work or food without a blemish. To bypass this, contemporary authorities utilize the sugya's discussion of selling to a gentile mid-birth[^17].
While Chullin 70a records a dispute between Rabba and Rav Huna regarding a sale executed during birth, the consensus of the Rishonim is that a sale executed before birth (selling the womb or the fetus to a gentile prior to labor) is universally effective to exempt the offspring from bechorah[^18]. The modern contract of mechirat bechorot is meticulously drafted based on the precise legal boundaries established in our sugya, ensuring that the gentile owns a share in the mother's womb (rechem) or the fetus itself before the "opening of the womb" sequence ever begins.
Takeaway
The consecration of a firstborn is not a static property of the flesh, but a dynamic, temporal process where the physical passage of birth retroactively sanctifies every moment of its own unfolding. When we encounter physical anomalies in the womb, Halacha looks past the chaos of the severed pieces to find the underlying unity of the opening event.
Footnotes
[^1]: Chullin 70a:1 s.v. "ואי אתמר בהא" [^2]: Chullin 70a:2; see also Mishnah Chullin 4:3 [^3]: Rashi on Chullin 70a:1 s.v. "ואי אתמר בהא בהא קאמר רבה" [^4]: Rabbeinu Gershom on Chullin 70a:1 s.v. "ואי איתמר בהא בהא קאמר רבה" [^5]: Tosafot on Chullin 70a:10 s.v. "אי נימא רובו ממש" [^6]: Rambam, Mishneh Torah, Firstborn Animals 4:1 [^7]: Dor Revi'i on Chullin 70a:2:1 [^8]: Rashi on Chullin 70a:10 s.v. "אי נימא רובו ממש" [^9]: Sha'arei Yosher, Sha'ar 3, Ch. 12; see also Chullin 70a:10 [^10]: Chullin 70a:8 [^11]: See Chullin 58a and Temurah 30b for the classic debate on ubar yerech imo vs. ubar lav yerech imo. [^12]: Chidushei Rabbeinu Chaim Halevi, Hilchot Bechorot 4:1 [^13]: Exodus 13:2 [^14]: Shulchan Aruch, Yoreh Deah 315:1; see also Shach ad loc. [^15]: Chullin 70a:18 [^16]: Bava Kamma 46a [^17]: Chullin 70a:1 [^18]: See Mishneh Torah, Firstborn Animals 4:5 and Shulchan Aruch, Yoreh Deah 320:1.
derekhlearning.com