Chullin 138

Sugya Map

• Issue: Defining the legal status of the "first shearing" (reishit ha-gez), the quantitative threshold for the mitzvah, and the transactional mechanics of ownership regarding priestly gifts.
• Nafka Mina:
  • Whether the mitzvah of reishit ha-gez is land-dependent (ha-tluya ba-aretz) or personal.
  • Whether the obligation attaches at the moment of shearing or at the moment a cumulative quorum (five fleeces) is reached.
  • Whether a seller can transfer the "burden" of the priestly gift to the buyer if the seller retains a portion of the sheep/wool.
• Primary Sources: Deuteronomy 18:4, Chullin 138a, Mishnah Pe'ah 3:5, Mishnah Chullin 11:1.

Text Snapshot

• Chullin 138a: "Rabbi Yehoshua ben Levi said: The verse states: ‘To stand to serve in the name of the Lord’ Deuteronomy 18:5."
• Nuance: The Gemara probes the shiur (measure) of the wool. It is not merely a weight but a functional category: davar ha-ra'uy la-avodah (a matter fit for service). The text moves from a quantitative definition to a qualitative one—the wool must be capable of forming a belt (the priestly avnet). Note the dialectic: if the garment is too large (like the me'il), it fails the bitul test; if too small (like the mitznefet), it fails the equality test (shaveh le-Aharon u-le-vanav).

Readings

Rashi (138a s.v. davar ha-ra'uy la-avodah)

Rashi highlights the functionalist approach of the Gemara. The chiddush here is that the mitzvah of reishit ha-gez is not an arbitrary tax but a symbolic participation in the avodah (Temple service). By requiring enough wool for a priestly belt, the Torah mandates that the householder’s contribution be intrinsically connected to the sanctity of the Kehunah. The wool is effectively "pre-consecrated" by its potentiality.

Rav Nissim Gaon (in the context of the shiur of the maneh)

The Acharonim often grapple with the fluctuating definition of a maneh (40 sela vs. 25 sela). The chiddush presented in the discussion regarding the keli (flask) is that halakhic definitions of "finished vessels" (gmar melacha) are tethered to utility. If a hole allows the loss of the item's contents, it ceases to be a vessel. This provides a meta-legal heuristic for reishit ha-gez: the shiur is not arbitrary but is defined by the halakhic utility of the wool. The shift from "forty sela" to "sixty sela" reflects the tension between regional standardizations (Judean vs. Galilean).

Friction

The Kushya: Rava challenges Rav Chisda regarding the sale of trees (Pe'ah) vs. the sale of wool. If the seller retains a portion of the trees, he remains liable for the Pe'ah of the entire set. Rava argues this only holds if the seller began the harvest. Since reishit ha-gez does not have a "start of harvest" trigger that obligates the whole flock, why should the seller remain liable simply because he kept a remnant?

The Terutz: The Gemara pivots to the principle that "a person does not sell the gifts of the priest." This is a profound chiddush in property law: the priest's share is essentially a "carve-out" that the owner never possessed in a full, alienable sense. Therefore, if the seller retains even a fraction, he remains the "owner" of the mitzvah obligation. The buyer cannot be held liable because the seller, by withholding a portion, has signaled that the priestly gift remains an encumbrance on the seller’s original title.

Intertext

• Leviticus 19:9: The source for Pe'ah. The comparison here is essential; the Gemara uses the logic of "reaping the harvest" to build a binyan av (archetypal structure) for how ownership transitions during partial sales.
• Mishnah Chullin 132a: The case of the butcher and the matnot kehunah (priestly gifts in the innards). This serves as the locus classicus for the rule: ein adam mokher matnat kehunah (a person cannot sell that which belongs to the priest). This provides the necessary legal fiction to resolve the tension in 138a regarding who bears the mitzvah burden.

Psak/Practice

The halacha follows the principle that reishit ha-gez is a personal obligation (chovat gavra) and not merely a land-based tax, though it is often grouped with the latter. In contemporary practice, the mitzvah remains relevant in Israel for those who own sheep, but the meta-psak takeaway is the "non-alienability" of gifts. When one sells a commodity that has a religious tax attached, the tax is not a "debt" that transfers automatically; it is an intrinsic portion of the property that was never part of the transaction to begin with.

Takeaway

The mitzvah of reishit ha-gez is not an external tax on sheep; it is the recognition that the priest’s share is a prior lien on the wool. We do not sell what is not ours to sell, and the shiur of the gift is defined by its fitness for the avodah—the utility of the sacred.