Mishnah Kelim 13:4-5

Sugya Map

• Primary Issue: The threshold of tuma’ah for broken metal implements. Does the "utility" of a remnant define its status as a keli (vessel), or does the original identity of the whole object persist?
• Core Parameters: Shiur (the minimum functional size, e.g., melo-hasit), shimush (functional capacity), and the distinction between guf ha-keli (the body) and shinnui (the edge/adaptation).
• Nafka Minot:
  • Whether a broken tool remains a keli if it can perform a different secondary function (e.g., a broken shovel acting as a hammer).
  • The status of "composite" tools—when does the loss of a specific component render the entire apparatus tahor?
• Primary Sources: Mishnah Kelim 13:4-5, Rambam, Mishneh Torah, Hilchot Kelim 11:1-4, Rash mi-Shantz, Kelim 13:4.

Text Snapshot

The Mishnah pivots on the transition from the functional whole to the residual part.

• "המעצד והאזמל... נפגמו... טמאים; ניטל חיסומן — טהורים" (Mishnah Kelim 13:4).
• Leshon Nuance: Note the term chisuman (חיסומן). Rambam (ad loc.) identifies this as the hardening or the welded edge of superior steel. The dikduk implies that the chisum is not merely an accessory but the telos of the tool’s utility. When the edge is lost, the iron is no longer a keli but shever kli (a broken vessel fragment), which generally lacks susceptibility unless it remains functional for a similar task.

Readings

The Rambam: The Functionalist Realist

Rambam (in his commentary to the Mishnah and Hilchot Kelim 11:1) asserts that the susceptibility of these tools is tied strictly to their ability to perform their usual work. If a magrifah (shovel) loses its spoon, it remains susceptible only if the remaining shaft can function as a hammer (kurnas). The chiddush here is that the keli does not have an ontological "essence" that survives damage; rather, it possesses a "functional identity" that migrates. If the object can be repurposed for a recognizable, standard craft—even if not the one for which it was forged—it remains a keli.

Rash mi-Shantz: The Structuralist

Rash (ad loc.) focuses heavily on the melo-hasit (the span of a hand, roughly four fingers) as the baseline for tahor vs. tamei. Regarding the megerah (saw), he argues that if the teeth are damaged such that a melo-hasit of consecutive teeth does not remain, it is tahor because it is no longer chazi (fit) to cut through wood. His chiddush is that the "totality" of the keli is defined by the continuity of its functional elements. Unlike Rambam, who looks at the "what else can it do" question, Rash looks at the "can it still do the primary thing" question. If the megerah cannot drag/saw, the residual metal is discarded material, not a vessel.

Friction

The Kushya: The Conflict of Shatuf vs. Tashmish

The primary friction lies in the contradiction between the status of the chisum (the edge) and the guf (the body). Why does the loss of the chisum render the entire tool tahor, even if the iron body remains? If the chisum is just an attachment, the body should retain its tuma’ah status as a keli of iron.

The Terutz

The terutz lies in the halachic definition of a "metal vessel." Metal is not considered a keli by virtue of its raw material, but by its tzurah (form). When the chisum—the very part that facilitates the melachah—is removed, the tzurah of the keli is effectively annihilated. It is no longer an adze or a drill; it is merely a lump of iron. As Rambam notes, the chisum is the "hardened steel" (parzela hindua). Without the working edge, the tool has lost its keli-hood. The tuma’ah does not attach to the weight of the iron, but to the operational integrity of the form.

Intertext

• Leviticus 11:32: The Torah mandates that any keli that falls into a sheretz becomes tamei. The Sages derive from the word keli (vessel) that it must be an object of defined utility. Mishnah Kelim 13:4 serves as the practical application of this verse: at what point does a keli cease to be a keli?
• Shulchan Aruch, Orach Chayim 308:35: The laws of muktzeh often parallel these Kelim definitions. An object that is no longer a keli (because it is broken) loses its status, which impacts whether it can be moved on Shabbat. The Kelim analysis provides the structural basis for the muktzeh status of broken items.

Psak/Practice

In modern applications, the heuristic of shimush (functional use) remains the standard. If a piece of hardware (e.g., a kitchen utensil) is broken, the question of whether it remains a keli (and thus potentially tamei or subject to tevilah) depends on whether the average person would still categorize the remnant as a functional tool. If the chisum (the critical working edge) is missing, the tool is tahor. If the item is so damaged that it cannot perform its original or a secondary standard task, it is effectively batel (nullified), a principle frequently applied in tashmish-kedushah (sacred objects) and tashmish-mitzvah.

Takeaway

Susceptibility to tuma’ah in metal tools is not a property of the metal, but a byproduct of the keli's functional form. When the working edge (chisum) perishes, the keli perishes; the metal remains, but the vessel has left the building.