Mishnah Kelim 10:5-6

Sugya Map

• Issue: The efficacy of tzamid patil (tightly fitting cover) when the integrity of the vessel’s wall is compromised by structural damage (peeling) or non-standard construction.
• Nafka Mina: Whether a secondary lining (pitch/tar) acts as a dofen (wall) sufficient to sustain the legal status of a "closed vessel" for the purposes of taharah.
• Primary Sources: Mishnah Kelim 10:5-6; Rambam, Commentary on the Mishnah, Kelim 10:5; Tosafot Yom Tov, Kelim 10:5.

Text Snapshot

"If a jar had been peeled off but its pitch remained intact... Rabbi Judah says: they do not protect. But the sages say: they do protect" Mishnah Kelim 10:5.

• Leshon Nuance: The term niktalfa (peeled) describes the loss of the earthenware wall, leaving only the internal pitch lining. The debate hinges on whether the pitch acts as a dofen in its own right or merely a supplemental seal.

Readings

• Rambam: Argues the pitch functions as a distinct secondary vessel wall. If the cover seals against the pitch, it constitutes a valid tzamid patil. He explicitly rules against R' Judah, holding that structural continuity of the original clay is not required, provided the seal is airtight.
• Tosafot Yom Tov: Analyzes the Ra'avad’s objection, distinguishing between "peeling" clay and "peeling" pitch. He posits that the chiddush of the Sages is that the pitch, once serving as the functional lining, inherits the halachic status of the vessel wall.

Friction

• Kushya: If the vessel is defined by its cheres (earthenware) status, once the clay wall is gone, is it still a "vessel"? If it is not a vessel, how can it possess a "mouth" capable of tzamid patil?
• Terutz: The Sages define the vessel functionally: as long as the tzamid (seal) and the patil (the object sealed) are structurally linked to the dofen (the wall), the halachic "envelope" remains intact, regardless of the material composition of the wall itself.

Intertext

The logic of the Sages mirrors the principle in SA Yoreh Deah 137, where the lining of a vessel can dictate its status for kashering purposes. The "pitch lining" acts as a structural surrogate, reminiscent of the legal fiction applied to mechitzot in Hilchot Eruvin.

Psak/Practice

In contemporary taharah heuristics, this teaches that "integrity" is not aesthetic but functional. If a seal is airtight (tzamid patil), the status of the vessel is maintained. Meta-halachically: where a primary structure fails, a secondary, reinforced interface (the pitch) can sustain the legal reality.

Takeaway

Halacha prioritizes the functional integrity of the seal over the ontological purity of the vessel’s original material. If the seal holds, the vessel remains a vessel.