DAAT · LEVEL 3 — MASTER SYNTHESIS
Siman שמ"ה
סימן שמ"ה · דִּין אַרְבַּע רְשֻׁיּוֹת לְשַׁבָּת
Recap & mnemonics for review
📑 Synthesis outline
- The central axiom of the siman
- The four reshuyos in a table
- The key measurements
- Decision tree — classifying a place
- Reshus hayachid vs. reshus harabim — the logic of each
- Mnemonic רְשׁוּת
- Pitfalls to avoid
- Practical cases
- Final synthesis table
- The practical takeaways
1. The central axiom
Siman שמ"ה in one sentence.
The issur of הוצאה (transferring) is moving an object from one reshus to another — so one must first define the reshuyos. The siman sets out four: reshus hayachid (RH"Y) and reshus harabim (RH"R), mid'Oraisa; karmelis, the intermediate one instituted by Chazal; and makom petour, where one carries freely. It all turns on geometry: mechitzos, area, height.
The issur of הוצאה (transferring) is moving an object from one reshus to another — so one must first define the reshuyos. The siman sets out four: reshus hayachid (RH"Y) and reshus harabim (RH"R), mid'Oraisa; karmelis, the intermediate one instituted by Chazal; and makom petour, where one carries freely. It all turns on geometry: mechitzos, area, height.
2. The four reshuyos
| Reshus | Definition | Carrying status |
|---|---|---|
| רְשׁוּת הַיָּחִיד (RH"Y) | Mechitzos of 10 tefachim surrounding 4×4 tefachim | Reshus mid'Oraisa; internal carrying is free |
| רְשׁוּת הָרַבִּים (RH"R) | Open way of 16 amos, uncovered, public thoroughfare | Reshus mid'Oraisa |
| כַּרְמְלִית | Intermediate: neither enclosed nor a public way (sea, plain) | Assur mid'rabbanan |
| מְקוֹם פְּטוּר | Less than 4×4, raised more than 3 | Exempt — carrying is free |
3. The key measurements
| Measurement | Role |
|---|---|
| 3 tefachim | Below this: "lavud to the ground" — the object counts as the ground |
| 4×4 tefachim | Minimal area of a significant reshus (RH"Y, karmelis) |
| 10 tefachim | Height of mechitzos for an RH"Y; ceiling of RH"R and karmelis |
| 16 amos | Width of an RH"R thoroughfare |
| 600,000 | Per the "yesh omrim": number of passersby required for an RH"R |
4. Decision tree — classifying a place
Q1: Is the place surrounded by mechitzos of 10 tefachim over a 4×4 area?
↓ YES → reshus hayachid (RH"Y)
Q2: Is it an open way of 16 amos meant for the public to pass through?
↓ YES → reshus harabim (RH"R) — see the 600,000 opinion
Q3: Is the place 4×4, while being neither enclosed nor a public way?
↓ YES → karmelis (assur mid'rabbanan)
Q4: Is the place less than 4×4 and raised more than 3?
↓ YES → makom petour (carrying is free)
→ At the slightest doubt about the measurements → consult your Rav.
5. Reshus hayachid vs. reshus harabim — the logic of each
| Aspect | Reshus hayachid (RH"Y) | Reshus harabim (RH"R) |
|---|---|---|
| Defining criterion | The mechitzos | The passage of the public |
| Airspace | RH"Y up to the sky | RH"R only up to 10 tefachim |
| Above 10 | Always RH"Y | Becomes makom petour |
| Model | A delimited, enclosed space | The desert encampment (diglei midbar) |
6. Mnemonic רְשׁוּת
ר — רְשׁוּת הַיָּחִיד: reshus hayachid — mechitzos of 10 tefachim surrounding 4×4; one carries freely within.
ש — שֵׁשׁ עֶשְׂרֵה אַמּוֹת: reshus harabim — an open way of 16 amos meant for the public to pass.
ו — וּבֵינוֹנִי: the karmelis — an "intermediate" reshus instituted by Chazal (sea, plain); carrying is assur mid'rabbanan.
ת — תֵּל קָטָן: makom petour — less than 4×4, raised; carrying is free.
7. Pitfalls to avoid
Pitfall 1: Thinking a reshus hayachid requires private ownership. "Yachid" means a space delimited by mechitzos — not property belonging to an individual.
Pitfall 2: Confusing karmelis and makom petour. The karmelis is 4×4 and carrying there is assur mid'rabbanan; the makom petour is less than 4×4 and carrying there is free.
Pitfall 3: Forgetting that an RH"R "holds" only up to 10 tefachim. Above 10, it is no longer a reshus harabim.
Pitfall 4: Ruling on one's own that a street is an RH"R mid'Oraisa. The question of 600,000 passersby carries heavy consequences (eruv) — it is a matter for a Rav.
8. Practical cases
| Place | Classification | Carrying |
|---|---|---|
| Apartment, house, enclosed courtyard | Reshus hayachid | Free within |
| A large open and busy avenue | RH"R, or karmelis per the 600,000 opinion | Assur |
| Sea, beach, large field | Karmelis | Assur mid'rabbanan |
| A narrow raised post or bollard | Makom petour | Free (to place on, to take from) |
| Balcony with a window opening from the house | Reshus hayachid (seif טז) | Free |
9. Final synthesis table
| Element | Detail |
|---|---|
| Subject of the siman | Defining the 4 reshuyos — the foundation of the melachah of הוצאה |
| Number of seifim | 19 |
| Mishnah Berurah | 87 entries |
| Talmudic source | Shabbos 6a — the beraisa of "arba reshuyos" |
| Major dispute | Does an RH"R require 600,000 passersby? (the basis of contemporary eruvin) |
| Practical ruling | Classify the place by mechitzos + area + height; consult your Rav |
10. The practical takeaways of Siman שמ"ה
For daily conduct
- Before carrying, identify the reshus of origin and of destination.
- Classify a place by three criteria: mechitzos, area (4×4), height (10).
- Remember the thresholds: 3 (lavud to the ground), 4×4 (a significant reshus), 10 (mechitzah / ceiling).
- The karmelis (sea, plain, open street per the opinions) — carrying is assur mid'rabbanan.
- In a doubt about classifying an actual place — consult your Rav.
- In-depth pilpul — Level 2; Chabad shitah — Level 4.
📚 Recap of the study path
You have studied Siman שמ"ה across 3 levels:
You have studied Siman שמ"ה across 3 levels:
- 🌱 Level 1 — Base: the 19 seifim, translation, halachic concepts
- ⚡ Level 2 — Lamdan: Talmudic sources, shitos of the Rishonim, machlokos, nafka minos
- ✨ Level 3 — Synthesis: axiom, mnemonic, decision tree, practical takeaways