DAAT · LEVEL 3 — SYNTHESIS
Siman רנ״ה
סימן רנ״ה · הכנת האש קודם הכנסת שבת
Recap and mnemonics for review
📑 Outline of the synthesis
- The central axiom
- The 3 categories of fuel
- Hierarchy of cases
- S-M-A mnemonic
- Decision tree
- Mehaber vs Rama
- 5 pitfalls to avoid
- Modern practical cases
- Final summary table
- The 5 practical commandments
1. The central axiom
שלהבת עולה מאליה: the flame must be autonomous before Shabbat enters.
Siman רנ״ה codifies a single principle — the lighting must be advanced enough that a person has no reason whatsoever to intervene on the "combustion" aspect of the Shabbat fire. The single criterion: the flame rises on its own, without help. This criterion is calibrated according to the fuel: for wood (slow to burn), it is demanding — majority of the thickness and circumference; for charcoal (which "self-relaunches"), it is minimal; for pitch/straw (rapid combustion), also minimal; for bundles of reeds/pits grouped together — demanding like wood.
Siman רנ״ה codifies a single principle — the lighting must be advanced enough that a person has no reason whatsoever to intervene on the "combustion" aspect of the Shabbat fire. The single criterion: the flame rises on its own, without help. This criterion is calibrated according to the fuel: for wood (slow to burn), it is demanding — majority of the thickness and circumference; for charcoal (which "self-relaunches"), it is minimal; for pitch/straw (rapid combustion), also minimal; for bundles of reeds/pits grouped together — demanding like wood.
2. The 3 categories of fuel
Category 1 — Slow (wood, logs)
- Several logs: spontaneous flame without support from the others
- Single log: majority thickness + majority circumference
- Sanction if insufficient: forbidden to benefit from it on Shabbat
Category 2 — Continuous (charcoal, electricity)
- Minimal lighting (כל שהוא) suffices
- Rationale: "self-relaunched" — continues to burn/heat on its own
- Modern application: plata, electric oven
Category 3 — Rapid (pitch, sulfur, straw, branches)
- Minimal lighting suffices
- Rationale: rapid and complete combustion
- Variant: reeds/pits scattered = category 3; in a bundle/basket = category 1
3. Hierarchy of cases
| Level | Type | Criterion |
|---|---|---|
| 1 — strict | Single wood log | Majority thickness + circumference |
| 2 — strict | Several logs / grouped bundles | Spontaneous flame without support |
| 3 — lenient | Charcoal, electricity, pilot gas | Minimal lighting / current |
| 4 — lenient | Pitch, sulfur, straw, dry branches | Minimal lighting |
| 5 — lenient | Scattered reeds/pits | Minimal lighting |
| 6 — variable | Reeds in a bundle, pits in a basket | Spontaneous flame (mahloket Yesh Omrim — opposite view) |
4. Mnemonic — S-M-A
S — Shalhevet (שלהבת): the flame must be visible and stable. Test: remove the match/source — the flame holds.
M — Mevourra (מבוערת): for wood as a single log — majority of the thickness AND of the circumference charred.
A — Auto (= self-relaunched): for charcoal, gas, electricity — a minimal lighting/current suffices, since the combustion will not extinguish naturally.
To memorize: "S-M-A for siman 255: Shalhevet (stable flame), Mevourra (majority of the wood), Auto (charcoal/electric = minimal)."
5. Decision tree
Question 1: Which fuel?
↓
Wood: single log = majority thickness + circumference; several logs = spontaneous flame
↓
Charcoal / electricity / gas: minimal lighting/current suffices ("self-relaunched" category)
↓
Pitch / straw / branches: minimal lighting suffices (rapid combustion)
↓
Reeds / pits: scattered = minimal; in a bundle/basket = spontaneous flame
↓
Question 2: At the moment Shabbat enters, is the criterion met?
↓
If YES → permitted to benefit from it on Shabbat (heat, light)
↓
If NO → muktzeh / forbidden; do not stoke, do not stir
6. Mehaber vs Rama
| Topic | Mehaber | Rama |
|---|---|---|
| Wood criterion (Seif Alef) | Spontaneous flame + (single log: majority thickness+circumference) | No gloss — follows the Mehaber |
| Charcoal (Seif Beit) | Yesh Omrim — minimal suffices | No gloss — accepts |
| Grouped reeds/pits (Seif Guimel) | Mahloket — Yesh Omrim בהיפך | No gloss — leaves the mahloket open |
| Application to Shabbat candles | Implicit (siman 263+) | Implicit; in practice: stable flame before lighting |
The Rama does not gloss this siman — it is one of the rare simanim in Hilkhot Shabbat where the Mehaber and the Rama agree without nuance. Unified practice for Sephardim/Ashkenazim/Chabad.
7. 5 pitfalls to avoid
Pitfall 1: Lighting the candles just before the time without verifying stability. Risk — if the flame flickers at twilight, the שלהבת עולה מאליה criterion is not met, and the candle becomes unusable on Shabbat.
Pitfall 2: Thinking that a log lit on the surface = OK. False for a single log: the majority of the thickness is required, not just the bark. Light at least 30 min before Shabbat enters.
Pitfall 3: If the fireplace goes out on Shabbat — trying to stir the logs to revive the flame. Forbidden — שמא יחתה ויניד. Let it go out.
Pitfall 4: Plugging in the plata without pre-heating it before Shabbat (thinking it will heat up). False — it must already be hot at the moment of entry to benefit from "self-relaunched" status.
Pitfall 5: Considering a pilot flame (gas pilot) as insufficient. On the contrary — the pilot flame = "self-relaunched" category (Seif Beit), perfect for Shabbat as long as it is active at entry.
8. Modern practical cases
| Case | Conduct |
|---|---|
| Shabbat candles (paraffin) | Wick lit, wax melting, stable flame before the time |
| Oil candles (shemen zayit) | Verify the oil flow through the wick — well-yellow flame |
| Electric plata | Plugged in and already hot at entry (≈ Seif Beit) |
| Oven in Shabbat mode | Mode activated + heating in progress before entry |
| Wood fireplace for the night | Logs well ablaze (majority thick.+circ. for a single log) |
| Automatic pellet stove | ≈ Seif Beit — continuous feed, minimal lighting suffices |
| Pilot light / gas pilot | Stable visible flame |
| LED lamp / automatic nightlight | Permitted (extended Seif Beit); does not fulfill the obligation of "ner Shabbat" |
| Incense / aromatic powder | Category 3 — minimal lighting |
| Flame going out on Shabbat | Do not intervene; let it go out. Relight after havdalah. |
9. Final summary table
| Element | Detail |
|---|---|
| Subject of the siman | Lighting the fire before Shabbat — conditions of stability |
| Number of seifim | 3 (Mehaber) — 4 (Admour HaZaken) |
| Talmudic source | Shabbat 20a · Mishna Shabbat 1:11 |
| Central criterion | שלהבת עולה מאליה (flame rising on its own) |
| Halakhic concepts | שמא יחתה ויניד, רוב עוביו ורוב הקיפו, פחמין דולקים והולכים, מפוזר vs אגוד |
| Modern application | Candles, plata, oven in Shabbat mode, fireplace, pellet stove, gas pilot |
| Rama's position | No gloss — unified practice Sephardim/Ashkenazim/Chabad |
10. The 5 practical commandments of Siman רנ״ה
For everyday conduct
- Visually verify that the flame is autonomous before entry — not just "it is lit." Test: the flame holds without assistance.
- Light early enough — for logs: at least 30 min. For candles: that the wax begins to melt. For the plata: that it is already hot.
- Single log = majority of the thickness AND of the circumference charred — not just the surface.
- "Self-relaunched" fuels (charcoal, electricity, pilot gas) = minimal lighting suffices; take advantage of this leniency for modern electrical devices.
- If the flame threatens to go out on Shabbat = do not intervene. Do not stoke, do not move, do not add. Let it go out — it is the same גזרה as for cholent (sim. 253).
📚 Recap of the study path
You have studied Siman רנ״ה across 3 levels:
You have studied Siman רנ״ה across 3 levels:
- 🌱 Level 1 — Base: 3 seifim, 3 key concepts (שלהבת עולה מאליה / שמא יחתה ויניד / fuel hierarchy), 5 modern cases
- ⚡ Level 2 — Lamdan: sugya Shabbat 20a, חקירה of שלהבת עולה מאליה (siman vs metziut), חקירה of רוב עוביו ורוב הקיפו, mahloket Yesh Omrim on the bundles, comparison with sim. 252-254
- ✨ Level 3 — Synthesis: axiom, S-M-A mnemonic, decision tree, 5 commandments