Mishnah Kelim 17:4-5

Sugya Map: Defining the "Functional" Vessel

• Core Issue: What constitutes a "broken" vessel (no longer keli) versus a functional one (susceptible to tumah)?
• Primary Conflict: The threshold of a hole (diameter vs. function).
• Nafka Mina: Whether we measure by an abstract, static volume (pomegranates) or by the specific utility of the vessel (what it is intended to hold).
• Primary Sources: Mishnah Kelim 17:4-5, Shabbat 112b, Eruvin 4a.

Text Snapshot

Mishnah Kelim 17:4: "All [wooden] vessels that belong to householders [become clean if the holes in them are] the size of pomegranates... Rabbi Eliezer says: [the size of the hole depends] on what it is used for."

• Leshon Nuance: The term shiur here is not a mathematical constant but an index of keli-hood. The Tosafot Yom Tov (17:4:1) notes the ambiguity of "three pomegranates attached," suggesting it implies a hole wider than a single pomegranate—essentially, a threshold where the vessel’s utility is compromised.

Readings

• Rash MiShantz (17:4:1): Highlights the tension between "pomegranate" as a universal measure and the functional reality. He argues that even when the gemara cites "the size of a pomegranate," it reflects a physical reality where multiple pomegranates (in a cluster) exert pressure, necessitating a larger hole to render the vessel "broken."
• Rambam (Hilchot Kelim 6:2): Codifies that a vessel remains tamei if it can still hold its contents. He prioritizes the functional status over the specific shiur of the pomegranate, effectively siding with the logic that a vessel is defined by its capacity to contain.

Friction

• Kushya: If shiurim are fixed (pomegranate size), how can Rabbi Eliezer argue that it depends on the vessel's specific usage?
• Terutz: The measure of a "pomegranate" is merely a default for "householder" vessels. For specialized vessels (gardeners/bathers), the shiur is a proxy for nullified utility. The pomegranate is not the essence of the measure; it is the standard unit for the average vessel.

Psak/Practice

The halacha largely follows the functionalist approach. As the Tosafot Yom Tov notes (17:4:2), even where there is a debate (e.g., Rabbi Meir vs. Rabbi Shimon), the principle that a vessel is susceptible as long as it retains its primary function remains a core meta-heuristic in Taharot. If a utensil can still perform its "job," the tumah status persists.

Takeaway

A vessel is not defined by its shape, but by its capacity to contain. If the "hole" is merely incidental to the vessel's function, it remains a keli.