Arukh HaShulchan Yomi · Expert – Beit Midrash Analysis · Standard
Arukh HaShulchan, Orach Chaim 317:11-18
Sugya Map
The definition of the melakha of Koshir (tying) on Shabbat is one of the most conceptually elusive areas of Hilchot Shabbat. Unlike Bishul (cooking) or Kotev (writing), which have clear physical transitions, Koshir operates on a spectrum of physical stability and human intent. The core of the sugya lies in Shabbat 111b–Shabbat 113a, which serves as the bedrock for the subsequent codification in Shulchan Arukh, Orach Chaim 317.
The Core Issues
- The Definition of Kesher Shel Kayama (Permanent Knot): Is "permanence" defined objectively by the physical durability of the knot, or subjectively by the intent of the person tying it?
- The Intersect of Uman (Craftsman) and Kayama (Permanence): Do we require both a professional-grade knot (ma'aseh uman) and long-term intent (kayama) to trigger a Torah prohibition (De'oraita), or is either one sufficient?
- The Temporal Thresholds: What are the boundaries of "temporary"? Is it under twenty-four hours, under seven days, or something else entirely?
[The Knotting Matrix (Koshir)]
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[Structural Dimension] [Temporal Dimension]
- Ma'aseh Uman (Professional) - Kesher Shel Kayama (Permanent)
- Kesher Hedyot (Layman) - Under 24 Hours / Under 7 Days
Nafka Minot (Practical Ramifications)
- Tying Shoelaces: If a double knot is tied with the intent to untie it within twenty-four hours, does it escape the Rabbinic prohibition of Koshir?
- Garbage Bags: Tying a plastic garbage bag with a double knot before disposal. Since it will never be untied, does its permanent intent make it a Torah violation despite being a simple layman's knot?
- Twist Ties: Does the act of twisting a plastic-coated wire around a bread bag constitute Koshir, or is it categorized under a different mechanical framework?
Primary Sources
- Talmudic Foundations: Shabbat 111b (the Mishnah of the knots of camel-drivers and sailors), Shabbat 112a (the discussion of aniva / slipknots).
- Halakhic Codifications: Rambam, Mishneh Torah, Hilchot Shabbat 10:1–5; Shulchan Arukh, Orach Chaim 317:1–4; Arukh HaShulchan, Orach Chaim 317:11–18.
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Text Snapshot
To appreciate the Arukh HaShulchan’s conceptual architecture, we must examine his precise phrasing in Orach Chaim 317:11–12. He addresses the core tension between the Rambam and Rashi regarding the definition of a Torah-level knot:
"ודע דעיקר קשירה האסורה מן התורה הוא דווקא בקשר של קיימא וקשר אומן... אבל קשר שאינו של קיימא ואינו קשר אומן מותר לכתחילה, וקשר שהוא של קיימא ואינו קשר אומן, או שהוא קשר אומן ואינו של קיימא, פטור אבל אסור."[^1]
Philological and Grammatical Nuances
The Arukh HaShulchan uses the phrase "ודע דעיקר קשירה" ("And know that the essence of tying..."). The word ikkar (essence/primary) here is not merely stylistic; it is a conceptual tool. By defining the ikkar of the melakha as requiring both kayama (permanence) and uman (craftsmanship), he aligns himself with the Rambam's binomial model.
Notice his use of the double negation: "שאינו של קיימא ואינו קשר אומן" ("which is neither permanent nor a craftsman's knot"). In the grammar of Halakha, when two negative conditions are met, the result is mutar lechatgila (permissible ab initio). However, if only one condition is met (e.g., it is kayama but not uman), it falls into the twilight zone of patur aval assur (exempt from biblical punishment but Rabbinically forbidden).
[^1]: Arukh HaShulchan, Orach Chaim 317:11.
Readings
The Rishonim and Acharonim split into distinct conceptual camps when defining the boundaries of Koshir. The Arukh HaShulchan (317:11–18) acts as a crucible, melting down these disparate views and casting them into a unified, highly practical framework.
[Conceptual Splits on Koshir]
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[The Rambam] [Rashi / Tosafot]
Binomial Model: Monomial Model:
Requires BOTH: Intent is paramount.
1. Ma'aseh Uman (Structure) Any knot meant to
2. Kesher Shel Kayama (Temporal) last forever is De'oraita,
Otherwise: Patur Aval Assur. even if simple (Hedyot).
Reading 1: The Rambam's Binomial Model (Structural & Temporal)
The Rambam Rambam, Mishneh Torah, Hilchot Shabbat 10:1 posits that the Torah prohibition of Koshir is governed by a strict, two-factor authentication system:
- The Structural Dimension (Ma'aseh Uman): The knot must be highly sophisticated, requiring the skill of a professional (such as a sailor’s knot or a camel-driver’s knot).
- The Temporal Dimension (Kesher Shel Kayama): The knot must be intended to remain intact indefinitely (le'olam).
If a knot lacks either of these components, it cannot be classified as De'oraita. For example, a layman’s knot (kesher hedyot) that is intended to remain forever is only Rabbinically forbidden (Derabanan). Conversely, a highly professional knot (ma'aseh uman) intended to be untied the same day is also Derabanan. Only when these two vectors intersect does one incur the liability of a chatat (sin offering).
Reading 2: Rashi and Tosafot's Monomial Model (Temporal Dominance)
Rashi Shabbat 111b s.v. "Kesher shel kayama" and the Tosafot Shabbat 111b s.v. "Koshir" reject this binomial requirement. They argue that the primary definition of Koshir under Torah law is determined by intent and duration.
If a person ties a simple layman's knot (such as a single knot over another single knot, a kesher al gabai kesher) with the intent that it remain forever (le'olam), they have violated a Torah prohibition. Under this model, ma'aseh uman is not an independent requirement for De'oraita status; rather, it is merely an indicator of permanence. A professional knot is assumed to be permanent, but a simple knot tied with permanent intent is equally forbidden min haTorah.
Reading 3: The Rif and Rosh's Temporal Division (The Seven-Day Rule)
The Rif Rif, Shabbat 40b and the Rosh Rosh, Shabbat 15:1 introduce a concrete temporal scale to resolve the ambiguity of "permanence." They classify knots into three distinct categories:
- Short-term (Under 24 hours): Completely permissible to tie and untie (mutar lechatgila).
- Medium-term (Between 24 hours and 7 days): Rabbinically forbidden (Derabanan).
- Long-term (Above 7 days / permanent): Forbidden min haTorah (according to Rashi) or Rabbinically (according to Rambam, if it is a layman's knot).
This tripartite division provides a practical taxonomy, but it introduces major conceptual friction when mapped onto the Rambam's structural requirement.
Reading 4: The Arukh HaShulchan’s Conceptual Synthesis (317:11-18)
Rabbi Yechiel Michel Epstein (Arukh HaShulchan 317:11–18) performs a masterclass in halakhic synthesis. He addresses the internal friction of the Shulchan Arukh Shulchan Arukh, Orach Chaim 317:1, which attempts to rule in accordance with both the Rif’s temporal categories and the Rambam’s structural categories.
The Arukh HaShulchan makes several key moves:
The Redefinition of Uman vs. Hedyot
The Arukh HaShulchan argues that the definition of a "craftsman's knot" (kesher uman) is not static. In antiquity, certain knots were proprietary to specific guilds (sailors, camel drivers). Today, however, the structural integrity of the knot defines its status.
He writes that a double knot—where one tie is placed directly over another—possesses a mechanical locking mechanism that prevents it from slipping. Because of this structural stability, a double knot functions as a kesher uman under modern parameters. This is a massive chiddush (novel insight): we do not look at the social status of the tier, but at the physics of the knot.
The Subjective Temporal Intent
In paragraph 14, the Arukh HaShulchan tackles the "seven-day" rule. He argues that the seven-day threshold is not an arbitrary Rabbinic decree, but a psychological benchmark. If a person ties a knot with no specific intention of when to untie it, but knows it will likely remain for a week, they have elevated that knot into the category of shel kayama (permanent).
Conversely, if there is a firm, concrete plan to untie the knot within twenty-four hours, the physical tie is conceptually "liquid" and does not constitute a kesher (knot) at all.
The Status of Aniva (The Slipknot / Bow)
In paragraph 16, he analyzes the slipknot (aniva). The Gemara in Shabbat 112a states that an aniva is not considered a knot.
The Arukh HaShulchan explains the mechanical reason for this: because a slipknot can be untied by pulling a single strand without unraveling the core twist, it lacks the physical definition of a knot (itkasherut). Even if an aniva is intended to remain forever, it is completely permissible to tie on Shabbat because it is structurally "non-existent" as a knot.
Friction
The integration of these various opinions creates significant conceptual friction. To fully grasp the Arukh HaShulchan's brilliance, we must explore the strongest kushya (difficulty) on his model and the terutz (resolution) he provides.
[The Core Friction]
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[The Kushya] [The Terutz]
How can the Mechaber rule like The Arukh HaShulchan
the Rif (7-day rule) AND the redefines "Uman" dynamically.
Rambam (Uman requirement)? A layman's double knot meant
If a layman ties a permanent simple to last forever is structurally
knot, is it De'oraita or Derabanan? stable enough to be "Uman."
The Kushya: The Mechaber's Internal Contradiction
The Shulchan Arukh Shulchan Arukh, Orach Chaim 317:1 presents a ruling that seems conceptually incoherent.
On one hand, he rules like the Rif and Rosh: any knot tied with the intent to remain for more than seven days is forbidden min haTorah. On the other hand, in the very same paragraph, he cites the Rambam's view: a Torah-level knot must be a ma'aseh uman (craftsman's knot).
This raises a massive difficulty, highlighted by the Pri Megadim and the Mishnah Berurah:[^2] If a layman (hedyot) ties a simple double knot (kesher hedyot) with the intent to leave it forever (le'olam), what is its status?
- According to the Rif and Rashi, this is a violation min haTorah because of the permanent intent.
- According to the Rambam, this is only Derabanan because it lacks the structural complexity of ma'aseh uman.
By placing both rulings side-by-side without resolving the structural-temporal split, the Shulchan Arukh leaves the reader in a state of conceptual paralysis. How can we rule practically when the two metrics—structural complexity and temporal intent—clash?
[^2]: Mishnah Berurah 317:1, s.v. "V'ain bo mishum koshir."
The Terutz: The Arukh HaShulchan's Dynamic Structuralism
The Arukh HaShulchan resolves this contradiction by introducing a revolutionary understanding of the physics of tying. He argues that the Mechaber (the author of the Shulchan Arukh) did not view the Rambam and the Rif as presenting two competing, irreconcilable systems. Rather, they are describing two sides of the same physical reality.
In Orach Chaim 317:12, Rabbi Epstein writes:
"אבל באמת לדינא אין כאן מחלוקת כל כך... דקשר אומן וקשר של קיימא תלויים זה בזה. כיצד? קשר שהוא חזק ומהודק מאוד, אפילו עשאו הדיוט, הרי הוא כקשר אומן מצד הידוקו."[^3]
The Conceptual Mechanics of the Terutz
- The Interdependence of Tightness and Time: The Arukh HaShulchan asserts that physical tightness (hiduk) and temporal permanence (kayama) are functionally identical. A knot that is tied extremely tightly (mehudak me'od) is structurally stable enough to withstand tension over time. Therefore, even if tied by a layman, its physical state elevates it to the status of ma'aseh uman.
- The Dissolution of the Social Definition of "Uman": The Arukh HaShulchan strips the term uman of its sociological definition (a professional craftsman) and replaces it with a mechanical definition (structural resistance to unraveling). A layman's knot that is tied to last forever must, by definition, be tied tightly. If it is tied tightly, it is structurally a kesher uman.
- Resolving the Mechaber: The Shulchan Arukh can rule like both the Rif and the Rambam because they converge in practice. If a knot is meant to last forever (Rif's kayama), the person will naturally tie it tightly. This tight tie transforms the layman's knot into a professional-grade knot (Rambam's uman). Thus, a tight, permanent layman's knot is indeed forbidden min haTorah according to all opinions!
[^3]: Arukh HaShulchan, Orach Chaim 317:12.
Intertext
To fully appreciate how the Arukh HaShulchan's model operates, we must examine its parallels in the broader corpus of Rabbinic literature, tracing the conceptual roots back to the Mishkan and comparing his views with contemporary Acharonim.
[The Archetypal Roots of Koshir]
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[The Mishkan] [The Chazon Ish]
Knots on the nets of the Mechanical focus:
Chilazon fishers. If a knot is tight enough
Temporary journeys, yet to require effort to untie,
conceptually permanent. it is "Koshir" regardless of time.
Parallel 1: The Mishkan Archetype and the Paradox of Permanence
The Talmud Shabbat 74b derives the melakha of Koshir from the construction of the Mishkan (Tabernacle). Specifically, the hunters of the Chilazon (the snail used to dye the Techelet blue threads) tied and untied their nets.
This raises a fascinating conceptual paradox, discussed extensively by the Rishonim: The Mishkan was a mobile sanctuary. It was dismantled and moved from station to station in the Wilderness. If so, all the knots tied in the Mishkan's curtains and nets were, by definition, temporary! How can we derive a Torah prohibition for permanent knots (kesher shel kayama) from a prototype that was inherently temporary?
The Tosafot's Resolution
The Tosafot Shabbat 111b s.v. "Koshir" explain that since the journeys of the Jewish people in the wilderness were determined solely by the Divine cloud, and they often stayed in one location for many years (sometimes up to nineteen years), any knot tied for the duration of a station was considered "permanent" in the eyes of Halakha.
The Arukh HaShulchan's Application
The Arukh HaShulchan uses this Mishkan parallel to ground his definition of temporal permanence. He argues that "permanence" does not require absolute, infinite duration. Rather, it is defined by functional independence.
If a knot is tied to serve a purpose for an indefinite period, without a looming, predetermined deadline for its disassembly, it shares the character of the Mishkan's knots and is classified as shel kayama.
Parallel 2: The Chazon Ish's Mechanical Definition
We can better understand the Arukh HaShulchan's conceptual framework by contrasting it with the Chazon Ish (Orach Chaim 52:17).[^4]
The Chazon Ish presents a highly mechanical, objective approach to Koshir:
- The Chazon Ish: Focuses almost exclusively on the physical state of the knot. If a knot is tied tightly enough that it cannot be undone without deliberate, effortful picking, it is classified as a kesher. The subjective intent of the person to untie it within twenty-four hours is secondary to the physical reality of the tight tie.
- The Arukh HaShulchan: Maintains a dynamic balance between the physical state and subjective intent. For Rabbi Epstein, even an incredibly tight knot is not a kesher under Torah law if there is an absolute, objective intent to untie it within twenty-four hours. The temporal intent acts as a conceptual solvent, preventing the physical tie from solidifying into a halakhic "knot."
[^4]: Chazon Ish, Orach Chaim, Kuntres HaShiurim 52:17.
Psak/Practice
How does the Arukh HaShulchan's nuanced framework land in the practical world of halakhic decision-making? Let us examine four common modern scenarios.
1. Garbage Bags (The Double-Knot Dilemma)
[Garbage Bag Knotting]
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[Double Knot] [Single Knot / Bow]
- Never untied (Permanent). - Mechanically unstable.
- Structurally tight (Uman). - Not a halakhic "Koshir."
- VIOLATION of Koshir. - PERMISSIBLE.
- The Scenario: Tying a plastic garbage bag with a double knot (a single knot over another single knot) before throwing it into the dumpster.
- The Halakhic Analysis: Since the bag is being discarded, the knot will never be untied (le'olam). According to the Arukh HaShulchan, a double knot provides structural stability (hiduk), elevating it to ma'aseh uman. When combined with the permanent intent, this constitutes a potential Torah-level violation of Koshir.
- The Practical Psak: One must avoid tying a double knot on garbage bags on Shabbat. Instead, one should tie a single knot combined with a bow (aniva), or use a single knot that is loose enough to slip, or use the integrated drawstring handles tied in a simple bow.
2. Shoelaces
- The Scenario: Tying shoes on Shabbat morning using a standard double-knot (a bow tied over a single knot) to prevent them from coming undone during a long walk.
- The Halakhic Analysis: A bow over a single knot is technically an aniva (slipknot) over a kesher (knot). The Arukh HaShulchan (317:16) rules that since shoes are meant to be taken off at night, the temporal duration is strictly under twenty-four hours. Therefore, the knot is conceptually "liquid" and lacks the definition of kayama.
- The Practical Psak: Permissible, provided the shoes are intended to be untied within twenty-four hours. However, tying a true double-knot (one tight knot directly over another tight knot, without a bow) should be avoided if there is any chance it will be left intact for more than twenty-four hours.
3. Twist Ties (Bread Bags)
- The Scenario: Closing a loaf of bread using a plastic-coated wire twist tie.
- The Halakhic Analysis: Does twisting wire constitute Koshir? The Arukh HaShulchan argues that Koshir is a melakha defined by the friction of fibers wrapping around one another to form a knot. Twisting a single piece of metal or plastic does not fit the physical definition of Koshir; rather, it falls under the category of Boneh (building/shaping) or is completely permissible because it is designed for constant, temporary opening and closing.
- The Practical Psak: Most contemporary authorities, aligning with the Arukh HaShulchan's focus on the physical mechanics of fiber friction, permit the use of twist ties on Shabbat, provided they are twisted loosely and meant to be opened within twenty-four hours.[^5]
[^5]: See Shemirat Shabbat Kehilchatah 15:65.
Takeaway
The Arukh HaShulchan redefines the melakha of Koshir from a rigid set of ancient definitions into a dynamic field where physical tightness and subjective temporal intent continuously shape one another. A knot is not merely a physical structure, but a reflection of human intent projected onto physical matter.
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