Mishnah Kelim 4:3-4

Sugya Map

• Issue: The susceptibility of broken earthenware (shivre cheres) and the criteria for defining a "functional" vessel versus a mere shard.
• Nafka Mina: Whether a shard that requires external support (smichah) retains status as a keli susceptible to impurity.
• Primary Sources: Mishnah Kelim 4:3-4; Rambam, Hilchot Kelim 4:1-3.

Text Snapshot

• Mishnah 4:3: "A potsherd that cannot stand unsupported... is clean."
• Mishnah 4:4: "Bowls with Korfian bottoms... although they cannot stand unsupported, are susceptible to impurity, because they were originally fashioned in this manner."
• Nuance: The shift from le-ma’aseh (accidental breakage) to le-katchila (original design). The "standability" test is a diagnostic for utility, but the da’at of the maker overrides the physical mechanics of the object.

Readings

• Rambam (Comm. ad loc.): The chiddush is the distinction between a broken vessel that loses its utility (gistera) and a vessel designed to be unstable. If the instability is inherent to the design, it is a keli ab initio.
• Tosafot Yom Tov (4:3:7): Explicitly links the halacha to the Kelim 2:2 criteria. The requirement that a shard must "sit" (stand) unsupported is only a test for vessels that were intended to stand. If the design intent was different, the physical test is bypassed.

Friction

• Kushya: If tum’at cheres is fundamentally about the vessel's capacity to hold (or its status as a "vessel"), why does the design intent matter more than the physical reality of the shard?
• Terutz: The status of keli is not merely physical volume; it is a legal category defined by shimusho (usage). If the Zidonian cups were designed to be held or supported during use, their "inability" to stand is not a defect, but a feature of their utility.

Intertext

• Shulchan Aruch, Orach Chaim 302: The laws of keli regarding Shabbat carry-over often rely on these Kelim definitions—if it isn't a keli for tahara, it often isn't a keli for melacha.

Psak/Practice

The halacha holds that if an object's incapacity to stand is a result of the craftsman’s intent (le-katchila), it remains a keli. If the incapacity is a result of breakage, it is a shard.

Takeaway: Intentional design creates a vessel; accidental breakage creates a remnant. In halacha, teleology (the purpose for which it was made) consistently overrides raw physical geometry.