Mishnah Kelim 17:4-5

Sugya Map

• Issue: Determining the threshold of "usefulness" for wooden vessels regarding their susceptibility to ritual impurity (tumah). Once a vessel is perforated, at what point does it cease to be a "vessel" (keli) and become mere scrap?
• Nafka Mina: Whether a damaged object remains a keli (susceptible to tumah) or becomes tahor (immune).
• Primary Sources: Mishnah Kelim 17:4-5, Mishnah Kelim 3:1, Shabbat 112b, Eruvin 13b.

Text Snapshot

The Mishnah delineates the "pomegranate" standard:

"כל כלי בעלי בתים שיעורן ברמונים... שלשה אחוזים זה בזה" (Mishnah Kelim 17:4)

• Leshon Nuance: The term ahuzin (attached/clutched) implies a cluster. As noted by the Tosafot Yom Tov (17:4:1), this is not merely a geometric measurement of volume but a qualitative assessment of how items interact within the vessel. The requirement of three pomegranates specifically suggests that a singular pomegranate does not sufficiently exert the pressure needed to define the "limit of utility."

Readings

1. The Rash MiShantz: Geometric Realism vs. Functional Utility

The Rash MiShantz (17:4:1) grapples with the ambiguity of the "pomegranate" measure. He observes that while the Talmud frequently uses the shorthand k’motzi rimon (the size of a pomegranate), the Mishnah here qualifies it as shlosha ahuzin (three attached). He rejects the notion that this implies a larger volume requirement, arguing instead that it describes the physical arrangement—a tripod-like structure.

His chiddush is that the "measure" is functionally dependent on the movement of the vessel. The vessel is only tamei if the items remain inside during standard handling. Thus, the "pomegranate" is not a static unit of volume but a dynamic test of retention during transport. If the movement of the vessel (tilting, walking) causes the items to fall out, the vessel has lost its defining characteristic of "holding."

2. The Rambam: The Intentionality of the Maker

The Rambam (Commentary on Mishnah, 17:4:1) shifts the focus toward the user’s intent and the standard of the "householder." He posits that if a vessel is perforated to the point where it cannot hold the intended items during normal activity, it is effectively tahor.

His chiddush lies in the interplay between the object’s physical state and the societal norm. By referencing the "Italian standard" and specific, localized cubits, he establishes that halachic measurements are not abstract mathematical constants but are anchored in the historical and ergonomic realities of the Beit HaMikdash and the marketplace. The vessel’s status as a keli is a social construct: if it is so damaged that no one would realistically retain it, the Torah’s category of "vessel" no longer applies.

Friction

The Kushya

The most potent kushya arises from the conflict between the "single pomegranate" rule mentioned in the Gemara (Shabbat 112b) and the "three pomegranates" requirement here in the Mishnah. If the threshold for tumah is a hole the size of a pomegranate, why does the Mishnah insist on a cluster of three?

The Terutz

The Rash MiShantz offers a brilliant reconciliation: the "single pomegranate" in the Gemara refers to a theoretical capacity, whereas the "three attached" in our Mishnah refers to the actual state of the vessel when filled. When a vessel is full, the pressure of surrounding pomegranates prevents a single one from falling out of a smaller hole. Therefore, a larger hole (the size of three) is required to deem the vessel tahor, because only at that size would the items naturally spill out despite the supportive pressure of the other contents. The "three" is not a change in the definition of the threshold, but a recognition of the physics of a full vessel.

Intertext

• Shabbat 112b: The discussion of the "smaller/larger cubits" in Shushan Habirah aligns with the Mishnah’s focus on the discrepancy between "craftsman measurements" and "Temple measurements." This establishes a meta-halachic principle: professional standards are often calibrated to account for loss, but halacha maintains its own objective, often stricter, baseline.
• Shulchan Aruch, Orach Chayim 301: The concern for "what a person usually keeps" mirrors the laws of keli regarding hotza'ah (carrying on Shabbat). The Kelim definition of a "vessel" provides the foundational logic for what constitutes an object worth "carrying" in a ritual sense.

Psak/Practice

In contemporary halacha, these rules inform the status of broken items. The principle that a vessel is defined by its utility (does it hold its contents?) remains the operative heuristic. If a modern storage container is cracked, we apply the Kelim heuristic: if the hole is of a size that renders the vessel incapable of performing its primary function—holding the items intended for it—it is batel (nullified) as a vessel.

Takeaway

Halachic status is not merely physical existence; it is the intersection of utility and societal expectation. A vessel exists only as long as it performs the role it was intended to serve.