Halachah 1 — Plowing and Its Derivatives
One who performs even the smallest act of plowing is liable. The Rambam expands this category to include any action that improves the soil or prepares land for growth.
Examples include:
- removing weeds around trees,
- cutting grass to improve the land,
- leveling the ground,
- filling pits or lowering raised areas.
All these actions share a common function: preparing or improving land for cultivation, and therefore are treated as derivatives of plowing. Even minimal actions incur liability.
Halachah 2 — Sowing and Its Extensions
Sowing includes not only placing seeds in the ground but also any act that promotes plant growth.
This includes:
- pruning trees to enhance growth,
- watering plants,
- soaking seeds in water to initiate growth.
Watering is considered a derivative of sowing, because it directly contributes to growth. Similarly, soaking seeds activates their growth process.
Even the smallest act in this category is sufficient for liability.
Halachah 3 — Reaping and Removing Growth
Reaping requires removing a significant measure, defined as the size of a dried fig.
This category includes:
- harvesting crops,
- picking fruit,
- removing any plant from its place of growth.
The Rambam clarifies that removal is considered reaping even when the plant grows in unusual places, such as:
- on rocks,
- on other plants,
- or in containers connected to the ground.
However, if a plant grows in a container not connected to the ground (such as a non‑perforated pot), removing it is not considered reaping, since it is not its natural place of growth.
Halachah 4 — Actions with Dual Liability
Some actions may involve two categories simultaneously.
For example:
- removing certain plants causes both reaping (removal) and planting (promoting regrowth).
- pruning a tree with the intent to use the branches also combines both categories.
Similarly:
- lifting a clod of earth from the ground is considered uprooting,
- placing it back is considered planting.
These cases demonstrate how a single action can affect multiple halachic categories.
Halachah 5 — Measures Based on Intended Use
The amount for which one is liable depends on the intended purpose:
- For human consumption → size of a dried fig
- For animal fodder → enough to fill a young animal’s mouth
- For fuel → enough to cook part of an egg
This principle shows that halachic measurement is tied not only to quantity, but also to functional use.
Halachah 6 — Collecting Sheaves
Gathering produce into a unified form is a derivative of collecting sheaves.
For example:
- stringing figs together,
- forming a cluster of food items.
Even though the action may appear minor, creating a unified collection brings it into this category.
Halachah 7 — Threshing and Extraction
Threshing applies to separating edible parts from their natural coverings.
This includes:
- removing grain from husks,
- extracting substances from their source.
Examples include:
- milking animals,
- extracting blood (when needed),
- removing food from shells.
The key idea is separation by force of one component from another.
Halachah 8 — Special Case: Injury to a Human
When a person wounds an animal and needs the blood, it is considered extraction and is liable.
However, when one wounds a human being, even without needing the blood, it is still considered liable. The Rambam explains this uniquely:
The act relieves internal emotional pressure, making it constructive in a psychological sense.
Halachah 9 — Creatures with Significant Hides
Certain creatures are considered to have meaningful “hides,” making injury to them significant in Shabbat law.
The eight creeping creatures specified in the Torah fall into this category.
In contrast, most small creatures do not, and injuring them does not carry the same liability.
Halachah 10 — Squeezing Fruit (Extracting Liquids)
Squeezing fruit to extract juice is a form of extracting, and is liable when done with a significant amount.
Biblically, liability applies primarily to:
- grapes,
- olives.
However, important distinctions are made:
- squeezing directly into food is permitted (food from food),
- squeezing into a container is prohibited.
This reflects a key distinction between processing and consumption.
Halachah 11 — Winnowing, Separating, and Sifting
These three labors are closely related and involve separating components:
- winnowing (with wind),
- separating (selecting),
- sifting (using sieves).
Although they are conceptually similar, they are counted separately because each was performed in the Temple service.
Halachah 12–13 — Sorting (Borer)
Sorting laws are very detailed.
Liability applies when:
- separating using tools,
- removing unwanted material from food,
- or separating food for later use.
However, it is permitted to:
- select food by hand,
- for immediate consumption.
This introduces a critical rule: Sorting is only permitted when done by hand, for immediate use, and selecting the desired item.
Halachah 14 — Filtering Liquids
Filtering liquids using a proper filtering device is prohibited.
However, filtering is permitted when:
- the liquid is already clear,
- or the action does not significantly change the mixture.
Additional cases (like adding water to dregs or stirring mixtures) are allowed when the substance is still considered one mixture.
Halachah 15 — Grinding
Grinding involves breaking a substance into smaller particles.
This includes:
- crushing spices,
- cutting vegetables very finely,
- filing or shaping materials like wood or metal.
Even preparatory actions that produce usable materials fall under this category.
Halachah 16 — Kneading and Sifting
Kneading involves combining particles into a unified mass.
Examples include:
- making dough,
- mixing substances with water,
- forming clay or cement.
The Rambam extends this to soaking seeds that bind together, treating it as an act of kneading.
Core Principle of the Chapter
This chapter applies the general framework of the 39 categories to practical agricultural and food‑processing activities, defining:
- what actions belong to each category,
- what minimum amount creates liability,
- and how intent and function determine classification.
The central idea is:
Shabbat prohibits not only complete acts of creation, but even minimal participation in processes that transform, separate, combine, or prepare materials for use.