Siman ש"מ
📑 Synthesis plan
- The central axiom of the siman
- The key concepts condensed
- Hierarchy of cases — from broadest to most restrictive
- Decision tree
- Identifying the av — permanence, the key to the tolada
- Mnemonic "תוֹלָדָה"
- Pitfalls to avoid
- Modern practical cases
- Final summary table
- The practical imperatives
1. The central axiom
This siman gathers תולדות — "derivatives" of the avos melachos, applied to everyday actions: cutting hair and nails (gozez), writing and erasing (kosev/mochek), sewing and tearing (tofer/koreya), gathering and kneading (me'amer/lash). A tolada is assur to the same degree as its av — to recognize it is to understand the issur.
2. The key concepts condensed
| Concept | Av melacha | Application in the siman |
|---|---|---|
| תולדה | Derivative of an av | Assur to the same degree, often carrying chiyuv chatas |
| גוזז | Shearing | Hair, nails, wool, wart (seifim א-ב) |
| כותב / מוחק | Writing / erasing | Tracing, erasing, lettered cake (seifim ג-ה) |
| תופר / קורע | Sewing / tearing | Pulling a thread taut, gluing / separating (seifim ו-ח, יד) |
| מעמר / לש | Gathering / kneading | Massing into a block, seeds in water (seifim ט-יב) |
3. Hierarchy of cases
4. Decision tree
5. Identifying the av — permanence, the key to the tolada
The siman lines up innocuous acts — cutting a nail, breaking a cake, tightening a cord, wetting seeds. The delicate question is not "is it assur?" but "of which av is this act the derivative, and when does it cross the threshold?". Two intersecting criteria decide: the purpose (which av-effect the act produces) and the permanence (does the effect endure?).
| Everyday act | Identified av | The act crosses over when… |
|---|---|---|
| Breaking a decorated cookie | מוחק — erasing | the break runs through letters drawn on the cake |
| Marking a page with a fingernail | כותב — writing | the mark is lasting; a non-lasting crease remains permitted |
| Tightening a garment's cord | תופר — sewing | it is a stable join, not a passing knot |
| Putting seeds into water | לש — kneading | the water binds the matter into a mass |
The principle — a tolada is not lighter. One readily assumes a "derivative" is less severe than the av. This is false: the tolada is assur exactly like its av, and often carries חטאת. Cutting a nail is not "almost shearing" — it is shearing, because the result is the same. The av/tolada hierarchy classifies acts; it does not rank their severity.
The borderline case — permanence. It is what separates the permitted from the assur in the frontier cases. Tracing a letter in the air or marking a sefer with a nail without leaving a trace: nothing endures, so no כותב. But writing in the condensation on a windowpane, or in spread-out sugar, where the shape holds: the trace lasts, the threshold is crossed. The sorting rule: an effect that vanishes at once does not complete the melacha; an effect that remains does.
6. Mnemonic
תּ — תַּכְלִית: a tolada produces the same purpose as an av melacha.
וֹ — וְחַיָּב: and one is liable in the same way — the issur is not lightened.
לָד — לְזַהוֹת אֶת הָאָב: the key is to identify the av behind the everyday act.
→ תוֹלָדָה: same purpose, same issur, identify the av.
7. Pitfalls to avoid
8. Modern practical cases
| Situation | Reference | Conduct |
|---|---|---|
| Cutting nails, removing hair | Seifim א-ב | Assur (gozez); the mikveh case via a non-Jew — consult a Rav |
| Cake / cookie bearing letters | Seif ג | Do not break through the letters (mochek) |
| Writing in condensation, printed edge | Seif ד | A form of kosev / mochek — consult a Rav |
| Tape, stickers, glued packaging | Seif יד | Gluing = tofer, separating = koreya — consult a Rav |
9. Final summary table
| Element | Detail |
|---|---|
| Topic of the siman | The toldos of the avos melachos in everyday actions |
| Number of seifim | 14 |
| Mishnah Berurah | 45 entries |
| Talmudic source | שבת עג ע"א-עה ע"ב (פרק כלל גדול) |
| Guiding principle | A תולדה is assur to the same degree as its av melacha |
| Practical ruling | Follow the minhag of one's kehilla (Sephardi: Mechaber; Ashkenazi: Rama; Chabad: SAH HaRav) |
10. The practical imperatives of Siman ש"מ
For daily conduct
- Gozez — no cutting of hair, nails, wool, or a wart.
- Kosev / mochek — no forming or lasting erasing; do not break a lettered cake.
- Tofer / koreya — no pulling a thread taut, nor gluing / separating sheets.
- Me'amer / lash — no massing into a block, nor mixing seeds with water.
- Makeh be-patish — one does not "fashion" by breaking a shard or tearing paper.
- In doubt — consult your Rav. Pilpul: Level 2; Chabad shita: Level 4.
You have studied Siman ש"מ on 3 levels:
- 🌱 Level 1 — Base: the 14 seifim, translation, halachic concepts
- ⚡ Level 2 — Lamdan: Talmudic sources, shitos of the Rishonim, machlokos, nafka minos
- ✨ Level 3 — Synthesis: axiom, mnemonic, decision tree, practical imperatives