Arukh HaShulchan, Orach Chaim 308:43-50

Sugya Map

• Issue: The definition of kashur (tied) vs. matir (untying) regarding muktza and melacha in the context of knots (kesharim).
• Primary Sources: Shabbat 111b, Shulchan Aruch, Orach Chaim 317, Arukh HaShulchan, OC 308:43-50.
• Nafka Mina: Whether a "permanent" knot defined by utility or design triggers the issur d'oraita of koshair.

Text Snapshot

The Arukh HaShulchan (308:43) notes: "Kishurim—there is much confusion here among the masses, and many violate issurim without knowing." He emphasizes that the chiyuv hinges on ma'aseh uman (craftsman's work) vs. he'edi (temporary). Note the dikduk: he uses the term kashur as a functional descriptor of the knot's durability (kayama) rather than just its form.

Readings

• Rambam (Hilchot Shabbat 10:1): Defines the issur via ma'aseh uman. The chiddush is that davar hamitkayem (a lasting thing) is the objective yardstick, regardless of the user's intent.
• Arukh HaShulchan (loc. cit.): Argues that for modern items, if the knot is intended to be undone within a short window, it lacks the gmar melacha required for d'oraita. He shifts the focus from the type of knot to the duration of the tie.

Friction

• Kushya: If the issur is based on ma'aseh uman (Shabbat 112a), why does the Arukh HaShulchan allow knots based on user-intent (da'at)?
• Terutz: The Arukh HaShulchan posits that ma'aseh uman is not an abstract category, but a reflection of the nature of the object. If the object is not designed for permanent usage, even a complex knot loses its status as a "craftsman's knot" because it lacks the necessary tkiyut.

Intertext

• Shulchan Aruch, OC 317:1: The baseline for kesharim.
• Mishnah Shabbat 15:1: The classic triad of koshair, matir, and tzafira.

Psak/Practice

The Arukh HaShulchan adopts a lenient posture regarding temporary knots used in common daily life, provided they are not kusharim shel kayama. Practically: if it's meant to be undone by the end of the day, the issur dissipates.

Takeaway

The issur of koshair is not about the complexity of the loops, but the durability of the intent. If the knot is ephemeral, the melacha is null.