Mishnah Kelim 10:5-6

Sugya Map

• The Problem: Defining the mechanics of tzamid patil (tightly fitting cover) under conditions of structural compromise. Specifically, when a vessel is no longer a monolithic entity of clay/stone but a composite of earthenware and lining (pitch/gypsum).
• Nafka Mina: Can a secondary layer (pitch/tar) serve as the legal "vessel wall" to facilitate tzamid patil if the primary earthenware wall is breached?
• Primary Sources: Mishnah Kelim 10:5-6; Rambam, Commentary to Mishnah Kelim 10:5; Tosafot Yom Tov, Kelim 10:5; Rash mi-Shantz, Kelim 10:5.

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Text Snapshot

Mishnah Kelim 10:5 posits the materials capable of tzamid patil: "Those made of cattle dung, of stone, of clay... and wooden vessels that are always clean." The crucial dikduk lies in the transition to the broken vessel: "If a jar had been peeled off but its pitch [lining] remained intact... Rabbi Judah says: they do not protect. But the sages say: they do protect."

The term nitkalpah (peeled) implies a separation. The Rash mi-Shantz clarifies: "The jar was pitched from within, and the clay was removed [from the outside], but the pitch stands intact against it." The leshon here is precise: does the tzamid patil (the seal) relate to the cheres (earthenware) or the dofen (the wall, regardless of material)?

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Readings

The Rambam’s Structuralist Approach

Rambam, Commentary to Mishnah Kelim 10:5 offers a brilliant, almost architectural reading. He views the "peeled" jar as a hybrid entity. When the earthenware wall is breached and the hardened pitch remains, the vessel effectively becomes a two-layered object: the bottom layer is the hardened pitch, and the top is the lid. The Rambam argues that if the lid is pressed until it adheres to the pitch, the pitch acts as the dofen (wall) of the vessel.

His chiddush is that the efficacy of tzamid patil is not tethered to the chemical composition of the original vessel (earthenware) but to the physical integrity of the seal against the dofen. If the pitch has hardened to the point of structural autonomy—effectively acting as a vessel wall—it serves as a legitimate conduit for the seal. He rejects R' Judah because, in his view, the Sages recognize that the "vessel" is defined by its function as a container, and the pitch has assumed that role.

The Tosafot Yom Tov and the Ra’avad’s Objection

Tosafot Yom Tov, Kelim 10:5 brings the Ra’avad’s fierce critique. The Ra’avad bristles at the usage of the word kiluf (peeling) for earthenware, arguing that kiluf is linguistically reserved for soft, adhesive substances like tar (as in Avodah Zarah 75b). For earthenware, one should use the term shevirah (breaking).

The Tosafot Yom Tov attempts to salvage the Mishnah’s terminology by arguing that the Mishnah describes the interaction between the two substances: the clay is "peeled" off the pitch. This is a subtle but profound shift in lomdus. He posits that the Sages (Chachamim) are not merely lenient; they are identifying a din of chibur (connection). Because the pitch is bonded to the remaining earthenware, and the lid is bonded to the pitch, the entire system is legally unified. The "peeling" is not a destruction of the vessel, but a revelation of the secondary structural layer that was always there, latent.

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Friction

The Kushya: The Paradox of the "Vessel"

If the cheres (earthenware) is the primary material required for tzamid patil (per Leviticus 11:33), how can the Sages allow a patch of pitch to act as the seal’s anchor? If the clay is gone, is it still a keli cheres?

The Terutz: Two Models of Definition

1. The "Functional" Terutz (Rambam): A keli is a physical object that holds. The cheres is merely the catalyst for the tzamid patil mechanism. Once the pitch sets, it takes on the din of the vessel's boundary. The tzamid patil is a law of sealing, not a law of material purity. Therefore, as long as the seal is air-tight and fixed to the existing wall, the status of the vessel is preserved.
2. The "Composite" Terutz (Rash mi-Shantz): The vessel was originally a keli cheres. The partial breach does not negate the vessel's identity; it only necessitates a change in the mirkam (texture) of the wall. The pitch acts as a tikkun (repair) that the Sages accept as a valid extension of the vessel's boundary. It is not that the pitch is clay, but that the pitch maintains the vessel's state of being "a vessel."

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Intertext

• Leviticus 11:33: The foundational text for tzamid patil. The Mishnah expands this from simple "earthenware" to "vessels that protect." The Sifra on this verse suggests that tzamid implies a seal that cannot be moved, which aligns with the Mishnah's requirement for plastering (miruach).
• Shulchan Aruch, Yoreh Deah 121: The laws of tzamid patil carry over into the laws of kashrut and the absorption of forbidden substances in vessels. The Sages' leniency regarding the pitch suggests that in scenarios where a vessel is lined, the lining becomes the primary legal surface, a concept echoed in the Acharonim regarding modern vessel linings (enamel/Teflon).

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Psak/Practice

The Psak follows the Sages: if a jar is lined with pitch, and the earthenware wall is compromised, the seal remains effective provided the pitch itself is intact and the seal is plastered to that pitch.

Heuristic for the Beit Midrash: When evaluating the integrity of a "vessel" (in any halachic context involving boundaries, like eruv or tahara), we look at the functional boundary, not just the original material composition. If the boundary functions as a wall, it is a wall.

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Takeaway

The Sages teach us that legal identity is resilient; when the original structure peels away, the underlying lining—if it holds—maintains the integrity of the whole. Tzamid patil is a triumph of seal over substance.