Chullin 29

Sugya Map

• Core Question: Does "half" (machatzah) equal "majority" (rubo) in the context of shechita and tereifa?
• Primary Sources: Chullin 29a-b; Leviticus 19:5 (on tizbachuhu); Numbers 9:10-11 (on tzibbur).
• Nafka Mina:
  • Halachic: Whether a pause (shehiya) after cutting half a siman invalidates the animal.
  • Conceptual: Whether the act of slaughter is a cumulative process (beginning to end) or a terminal moment (the conclusion).
  • Jurisprudential: The distinction between a "conspicuous majority" required for tereifa versus the functional majority required for shechita.

Text Snapshot

• Text (29a): "אי אמרת מחצה על מחצה כרוב... איטרפא לה."
• Nuance: Rashi (s.v. ואי מחצה כרוב) explains that if half is deemed a majority, the pause (shehiya) occurring at the midpoint renders the animal tereifa because it is now treated as a severed windpipe. The leshon ("איטרפא לה") emphasizes that the state of being a tereifa is a definitive, irreversible legal status triggered by the act of the slaughterer himself.
• Text (29b): "רבי שמעון בן לקיש אומר משום לוי הזקן: שחיטה - אינה אלא גמר שחיטה."
• Nuance: The contrast between gmar (completion) and the duration of the act is the pivot point for the machloket between Resh Lakish and R. Yochanan.

Readings

Rabbeinu Gershom

Rabbeinu Gershom (ad loc.) focuses on the phenomenology of the shechita act. His chiddush is that if we define "half" as "not yet a majority," then the pause at the midpoint is legally invisible—the slaughter has not yet "begun" in any sense that would render the animal tereifa. He treats the shechita not as a continuous flow, but as a threshold event. If you haven't crossed the threshold of the rubo, you haven't touched the animal's legal status.

Rashba

Rashba (Chullin 29a, s.v. חדא בחולין וחדא בקדשים) addresses the redundancy of the Mishna’s laws regarding bird and animal slaughter. His chiddush is a methodological principle of the Tanna: even when a law is inferable through dikduk (exegesis of the text), the Tanna will explicitly state it to avoid ambiguity. He rejects the notion that the Mishna is merely "lazy" or redundant; rather, he views the repetition as a pedagogical safeguard to ensure that the rules for chullin (non-sacred) and kodashim (sacrificial) are treated as distinct domains, preventing a kal va-chomer from being misapplied.

Friction

The Kushya: Abaye's Paradox

Abaye presents a brilliant, if devastating, kushya to Rava: If we require a "clearly visible" majority to render an animal tereifa (as Rava argues), why should the threshold for shechita—the very act that legitimizes the consumption of meat—be any lower? If tereifa is a state of "damaged functionality," then the shechita must demonstrate "perfect functionality" until the moment of the kill. If we allow a non-visible, ambiguous majority in shechita, we risk consuming animals that are functionally tereifot.

The Terutz

Rava’s response is a masterpiece of legal compartmentalization. He distinguishes between the nature of the proof:

1. Tereifa: Requires a visible majority because the prohibition is grounded in the physical reality of the organ (the windpipe/gullet). The Torah is concerned with the integrity of the animal; if it looks like a majority-severed pipe, it is a tereifa.
2. Shechita: Is a formal act. The validity of shechita is not about the aesthetic appearance of the windpipe, but about the completion of the rite. Thus, "half" functions as a binary toggle in shechita law, regardless of whether it is "clearly visible" to the naked eye. The shechita is a legal construct; the tereifa is a biological status.

Intertext

• Leviticus 19:5 (tizbachuhu): The Gemara invokes this verse to derive the prohibition against dual-slaughtering. The drasha—splitting tizbach (singular) and hu (it)—functions as the primary check on the "majority" principle. It prevents the expansion of shechita into a communal, chaotic act.
• SA Yoreh De'ah 23:1: The Shulchan Aruch codifies the shehiya laws based on this very sugya. The psak follows the principle that shechita is a continuous process; any pause (shehiya) equal to the time of another slaughter disqualifies the act, mirroring the concern raised on 29a regarding the midpoint of the siman.

Psak/Practice

In contemporary shechita, the psak follows the stricture that shechita must be an uninterrupted motion. While the Gemara debates the status of "half," the practice is to treat the shechita as a shiur (a fixed measure of effort and time). Meta-halachically, this sugya establishes a heuristic: Legal status is not always synonymous with physical appearance. Just as a tzibbur (congregation) maintains a status that transcends the sum of its parts (the Pesaḥ example), the halacha of shechita creates a legal reality that overrides the physical state of the animal's throat.

Takeaway

Halachic validity is often a formalist construct, not a descriptive one; the law defines the "majority" to serve the needs of the mitzvah, regardless of the physiological reality. Shechita is not what the knife does to the flesh, but what the Torah defines as a completed act.