DAAT · LEVEL 3 — MASTER SYNTHESIS

Siman 309

סימן ש"ט · טִלְטוּל עַל יְדֵי דָבָר אַחֵר
Recap & mnemonics for review
Master synthesis · Hilchos Shabbos · 5 seifim
To memorize and review after Levels 1 & 2

📑 Synthesis Plan

  1. The central Axiom of the siman
  2. Key concepts condensed
  3. Hierarchy of cases — from broadest to most restrictive
  4. Decision tree
  5. The heart of the siman: שָׁכַח vs הִנִּיחַ עַל דַּעַת
  6. Pitfalls to avoid
  7. Modern practical cases
  8. Final synthesis table
  9. Practical directives

1. The central Axiom

Siman 309 in one sentence.
The rule of basis l'davar ha'asur: a permitted object which intentionally supports a muktzeh for the duration of Shabbat itself becomes muktzeh. Critical distinction: shachach (forgotten) ≠ hiniach al daat (placed intentionally). Once basis, always basis for the whole Shabbat (Rama).

2. Key concepts condensed

ConceptDefinitionApplication
בסיס לדבר האסור"Base of a forbidden object"Permitted object intentionally supporting muktzeh → muktzeh
שכח"Forgotten"Not basis; permitted to tilt to make it fall
הניח על דעת"Placed intentionally"Basis if for the duration of Shabbat
בטל אגב"Nullified to"Functionally integrated muktzeh = nullified
געגועין"Child's attachment"Exception for carrying a child with light muktzeh
הוקצה למקצת השבת"Set aside for part of Shabbat"= set aside for all of Shabbat (Rama)

3. Hierarchy of cases

1. Permitted object alone → always permitted.
↓
2. Permitted object with forgotten muktzeh on it → permitted to tilt to make it fall.
↓
3. Permitted object with functionally integrated muktzeh (battel agav) → permitted.
↓
4. Permitted object with muktzeh placed intentionally for Shabbat → basis, forbidden.
↓
5. Need for the space of the basis → one may move it entirely (tiltul min hatzad).

4. Decision tree

Q1: Is there a muktzeh on / in / attached to a permitted object?
↓
Q2: Is the muktzeh functionally integrated (plug, counterweight)?
↓
If YES → battel agav, the object is permitted.
↓
If NO, is it forgotten (without intent) or placed intentionally?
↓
Forgotten → tilt / shake to make it fall. Not basis.
↓
Placed intentionally for Shabbat → basis. The whole object is forbidden.

5. The heart of the siman: שָׁכַח vs הִנִּיחַ עַל דַּעַת

The whole siman hinges on one axis. A permitted object supporting a muktzeh can itself become muktzeh — בָּסִיס לְדָבָר הָאָסוּר. But not always: the table under the phone is sometimes locked for 25 hours, sometimes perfectly free. What decides is not the presence of the muktzeh — it is the will of the owner at the onset of Shabbat.

Why does intention make the basis?

Basis is not a physical "contagion": the muktzeh does not soil its support by touching it. It becomes basis because its owner has designated it, by his own decision, to bear the muktzeh during Shabbat. It is an act of thought — הַקְצָאָה — by which the person himself renounces using the support. Where there was no decision, there is no basis: the muktzeh is just an object placed there, and the support remains what it was.

שָׁכַח — forgotten: at the onset of Shabbat, the muktzeh was there without his willing it, or he intended to remove it. No designation → no basis → one may tilt or shake the support to make the muktzeh fall.
↓ conversely
הִנִּיחַ עַל דַּעַת — placed intentionally: one placed the muktzeh there wanting it to remain during Shabbat. The support is designated → it is basis → forbidden to move.

The edge case: what seals basis and what does not trigger it

Two boundaries frame the principle and reveal its full subtlety. First boundary — permanence: the Rama rules that הֻקְצָה לְמִקְצָת הַשַּׁבָּת — הֻקְצָה לְכָל הַשַּׁבָּת: it suffices that the object was designated at the onset of Shabbat; subsequently removing the muktzeh does not free the basis — it remains forbidden for the 25 hours. Second boundary — the will must be yours: if it is a third party who placed his muktzeh on your object, your item does not become basis — אֵין אָדָם אוֹסֵר דָּבָר שֶׁאֵינוֹ שֶׁלּוֹ. Only the owner can designate his own property.

The pitfall of reasoning: believing that "the muktzeh is no longer there, so the support is permitted again." False: basis sets at the onset of Shabbat and does not unbind. And believing that "muktzeh on my object necessarily renders it forbidden": also false — if it was forgotten, or placed by another, no designation took place, and the object remains free. The question is never "is there a muktzeh on it?" but "who put it there, and did he want it there for Shabbat?".

6. Mnemonic "שב"ב"

ש — Shachach (שכח) — forgotten = not basis, tilting OK.

ב — Basis (בסיס) — placed intentionally = basis, forbidden.

ב — Battel agav (בטל אגב) — functionally integrated = nullified.

— The fourth (hidden) principle: "הוקצה למקצת השבת = הוקצה לכל השבת".

7. Pitfalls to avoid

Pitfall 1 — The phone on the table before Shabbat: if the intent is for it to remain there ("I'd like to see it"), the table becomes basis and is forbidden to move the whole Shabbat. Solution: remove the phone before the onset of Shabbat.
Pitfall 2 — Bag with its muktzeh contents: even if the bag is ordinary, intentionally holding a phone / keys (muktzeh) = basis.
Pitfall 3 — Thinking removing the muktzeh frees the basis: false! The Rama rules: "הוקצה למקצת השבת — הוקצה לכל השבת". Once basis, it's for the entire Shabbat.
Pitfall 4 — Carrying the child with the phone in his hand: ga'aguin permits carrying with a stone (light muktzeh). Not with money / phone (machmas gufo, transport gezeira).
Pitfall 5 — Believing the stone in the basket makes basis: if the stone is structurally integrated (plug, counterweight), it is battel agav — not basis. The whole is permitted.

8. Modern practical cases

SituationStatusConduct
Phone left intentionally on the tableBasisTable forbidden whole Shabbat — remove before Shabbat
Phone forgotten on the tableNot basisPermitted to tilt to make it fall
Money in drawer (intent to keep)BasisDrawer forbidden
Shabbat candles on candleholderClassic basisCandleholder forbidden for duration — see 277, 279
Carrying baby holding permitted toyNo problemPermitted
Carrying baby holding a stoneGa'aguinPermitted
Carrying baby holding coinsMachmas gufo — no exceptionRemove money first
Sweater with keys in pocket since before ShabbatBasisSweater forbidden to move
Someone else placed his phone on your tableNot basis (Rama)Your table remains permitted

9. Final synthesis table

ElementDetail
Topic of the simanBasis l'davar ha'asur — the contagion of muktzeh
Number of seifim5
Mishnah Berurah29 entries
Talmudic sourceShabbat 141b-142b; sugya of "shachach" on the jar
Pivot conceptsBasis; shachach vs hiniach al daat; battel agav; ga'aguin
Rama's chiddushNo basis through another; permanence of basis
Practical decisionBefore Shabbat: remove all muktzeh from all permitted supports. During: act with discernment (forgotten vs intentional)

10. The practical directives of Siman 309

Before and during Shabbat — the basis checklist

  1. Before Shabbat: take inventory of supports (tables, bags, shelves) and remove any muktzeh not to be used during Shabbat.
  2. If muktzeh intentionally placed for Shabbat: the whole support becomes basis for 25 hours.
  3. Forgotten muktzeh: permitted to tilt / shake the support to make it fall.
  4. Battel agav: muktzeh functionally integrated = nullified (plug, counterweight).
  5. Ga'aguin: carrying child + light muktzeh permitted; not with money.
  6. If third party placed his muktzeh on your item: not basis, your item remains permitted.
  7. Need for the space of the basis: permitted to move it entirely (with the muktzeh).
  8. In doubt → do not move.
📚 Recap of the study path
You have studied Siman 309 in 3 levels:
  • 🌱 Level 1 — Base: the 5 seifim, English translation, halachic concepts
  • ⚡ Level 2 — Lamdan: talmudic sources, שיטות of the Rishonim, מחלוקות, נפקא מינות
  • ✨ Level 3 — Synthesis: axiom, mnemonic, decision tree, practical directives
To go further: Level 4 — Daat HaRav (shita of the Alter Rebbe on Shulchan Aruch HaRav siman 309).
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DAAT · Rav Yossef Haim Samama

Siman 309 · Level 3 — Master Synthesis