When renting a **Hamor** (donkey), the initial law distinguishes between renting it for a man versus a woman. If the animal is rented for a man to ride, a woman is not permitted to ride it. The reasoning is not based on the woman's weight, but on riding skill. A man is generally considered a better rider, capable of balancing his weight more effectively on the animal, whereas a woman might not sit properly, causing more strain. However, if the **Hamor** is rented specifically for a woman, a man would be permitted to ride it, as his superior riding skill would not cause undue strain. This rule applies to any woman, regardless of her size, whether she is large or small, pregnant, or even nursing a baby. The **Gemara** clarifies that this even includes a woman who is both pregnant and nursing, effectively carrying three individuals (herself, the unborn child, and the nursing baby), and it is still permissible. This is because when one rents a **Hamor** to a woman, it is understood that she might be in any of these situations, and such conditions are implicitly accepted.
From a related *Braita* (external teaching), we learn a principle regarding weight: a fish is weighed according to its stomach, meaning by what is inside it. A fish with a larger stomach will weigh more than one without. The practical difference (*nafka mina*) for this principle is in business transactions. If one sees a fish with a large stomach at the fish store, it should not be bought by weight until the insides are removed, as a significant portion of the weight comes from the internal organs, and the buyer would receive less actual fish. This principle is derived from the case of the pregnant woman, whose weight is higher due to what is inside her. The *Braita* specifically mentioning a pregnant woman teaches that there is a difference between a non-pregnant woman and a pregnant woman of the same apparent size; the pregnant woman will weigh more due to the internal weight. Similarly, two fish of the same apparent size may differ in weight due to their internal contents, thus emphasizing the need to remove the insides before weighing.
The **Mishnah** then discusses a case where a person rents a cow to plow in a mountainous area but instead plows in a valley. If the plowshare (*kankana*), which is the blade of the plowing gear, breaks, the renter is exempt from liability. This is because mountainous terrain, with its rocks, presents a greater risk of breakage. Since the owner gave permission for the more dangerous activity (plowing in the mountains), plowing in the less dangerous valley is implicitly permitted. Conversely, if the animal was rented for plowing in a valley and was used in the mountains, and the plowshare broke, the renter would be liable.
The **Mishnah** extends this principle to threshing. If an animal is rented to thresh beans (which are slippery) but is used to thresh wheat (which is less slippery), and it slips, the renter is exempt. However, if it was rented for threshing wheat and used for beans, the renter is liable, as threshing beans causes slipping and is therefore more dangerous for the animal.
The **Gemara** delves into a scenario where the animal was used in the permitted area (e.g., a valley), and the plowshare broke. In such a case, the renter is exempt, but the **Gemara** assumes one of the workers guiding the animal must be at fault. The question arises: which of the two workers—the one guiding the animal (the *darban*) or the one holding the plowshare—is negligent? One opinion suggests the guide is at fault, as incorrect steering could cause the plow to bend and break. The other opinion, which the **Gemara** concludes is correct, states that the one holding the plowshare is at fault for placing it too deep in the ground, causing it to pull and break. This worker is considered more responsible because they are directly operating the plow and should have anticipated the risk.
A novel point (*chiddush*) is introduced for a rocky or mountainous area. If the plowing occurred in such a dangerous place, both workers are held liable. This is because, in a hazardous environment, they should have warned each other. Even a slight veering off course by the guide or a slight over-deep placement by the plow-holder could cause breakage. In such a situation, where there is a doubt (*sefek*) as to which specific action caused the damage, both are considered negligent and must share the liability.
The **Gemara** then discusses the sale of an animal with blemishes. If a seller lists numerous blemishes (e.g., "it gores, it bites, it kicks, it squats") but the animal only possesses one of them, and the buyer purchases it, the sale is considered a mistaken transaction (*mekach ta'ut*), and the buyer can return the animal. This is because the buyer likely assumed the seller was exaggerating or lying to protect himself from future complaints, and therefore believed the animal to be sound. However, if the seller specifically names one blemish and then adds, "and it has other things," the buyer cannot return the animal if it has the specified blemish. In this case, the specific mention should have prompted the buyer to investigate before purchasing.
This principle is supported by a *Braita* concerning the sale of a servant. If a seller lists many defects for a female servant (e.g., "she is a drunken woman, she is crazy, she has epilepsy"), but she only has one of these, the sale is voidable. But if the seller specifies one defect and mentions "other things," the buyer cannot claim a mistaken sale if the specified defect is present. A further, more complex scenario is presented: what if the seller lists many blemishes, and the animal actually possesses *all* of them, but the buyer is only concerned about one specific blemish (e.g., biting)? If the buyer claims, "I knew it had blemishes, but I thought you were exaggerating, and I didn't think it had the one I was concerned about," this claim is rejected. Since the seller explicitly stated all the blemishes, the buyer had reason to suspect the animal had the specific blemish that concerned him and should have investigated. Therefore, the sale is valid, and the buyer cannot return the animal.
The **Mishnah** proceeds to discuss overloading an animal. If a person rents a **Hamor** to carry wheat (*chittin*), which is heavy, but instead loads it with barley (*se'orim*), which is lighter, the renter is liable if the animal is damaged. This seems counterintuitive since barley is lighter. The explanation is that the volume of the load is as significant a factor in straining the animal as the weight. The standard load for a **Hamor** is a *letek* of wheat, which is 15 *se'ah* (90 *kabin*). If the renter loaded the **Hamor** with barley to the same volume as the permitted wheat load, and then added three additional *kabin* of barley, he becomes liable. This is because even though the barley is lighter, the increased volume (three *kabin* represents 1/30th of the total volume) strains the animal. The rule is that exceeding the permitted volume by 1/30th, even if the total weight is less than the permitted weight, makes the renter liable.
A similar rule applies to overloading a camel. A camel can carry a *kur*, which is 30 *se'ah*. If one overloads a camel by one *se'ah*, this also constitutes a 1/30th increase in volume, making the renter liable. Thus, the principle is established that exceeding the permitted load by 1/30th of its volume, regardless of weight, can lead to liability.
The **Gemara** presents a major dispute (*mahlokah*) between **Abaye** and **Rava** regarding the interpretation of this **Mishnah**. **Abaye** maintains that volume is equivalent to weight in terms of liability. If one rents an animal for wheat but loads it with barley, and adds three *kabin* of barley, the renter is liable because the volume is exceeded, even if the total weight remains less than the permitted wheat weight. **Rava**, however, argues that volume only becomes a factor *after* the permitted weight limit has been reached. According to **Rava**, if one loads barley to the same *weight* as the permitted wheat load, and *then* adds more barley (thus increasing volume), one becomes liable. If the total weight of barley is still less than the permitted wheat weight, even with added volume, the renter is not liable.
The **Gemara** then cites a *Braita* that states if one rents an animal for 15 *se'ah* of wheat and loads it with 16 *se'ah* of wheat, he is liable. But if he only adds three *kabin* (which is half a *se'ah*), he is exempt. This *Braita* appears to support **Rava**'s position, as it implies that a full *se'ah* (a larger amount) is required for liability, while three *kabin* (a smaller volume increment) is not. **Abaye** reinterprets this *Braita* by explaining that the initial 15 *se'ah* were measured in "skimmed" (*mechukat*) bags, meaning they were not filled to their full capacity. Therefore, adding three *kabin* merely brought the load up to the full, "heaped" (*tafufot*) measure, and only an additional three *kabin* beyond that would constitute an actual overload. Thus, **Abaye** reconciles the *Braita* with his view.
The **Gemara** continues with other examples of overloading. For a human carrier, adding one *kav* (a small measure) over the agreed-upon load makes the hirer liable if the worker is injured. The **Gemara** addresses the question of why the hirer is liable, as the worker could have simply thrown off the extra load if it was too heavy. The answer is that the damage might have been instantaneous, or the worker might not have immediately realized that the extra load was the cause of his weakness or injury. Alternatively, this law refers to the worker's right to demand extra pay (*grai yeterai*) for carrying an additional *kav*, not necessarily for injury. Regarding boats, the **Mishnah** states that overloading a small boat by a *letek* (15 *se'ah*) makes the renter liable, a medium boat by a *kur* (30 *se'ah*), and a large boat by three *kurim*. From the rule that exceeding a small boat's capacity by one *letek* (15 *se'ah*) results in liability, and knowing the 1/30th ratio, **Papa** deduces that a standard, medium-sized boat is expected to carry 30 *kurim*. This information is useful in business transactions, for instance, when purchasing a boat, to ensure it meets the expected capacity.
The **Mishnah** then discusses the responsibility of a craftsman (*Uman*). It states that an *Uman* is considered a **Shomer Sakhar** (paid guardian) for an item entrusted to him, meaning he is liable if the item is stolen or lost. This responsibility continues until he declares his work finished and demands payment, at which point his level of guardianship changes. The **Mishnah** provides further examples of guardianship: if two friends agree, "You watch my item, and I'll watch yours," they are both considered **Shomer Sakhar** because the mutual watching acts as payment. If one friend says, "Watch my item," and the other replies, "Put it over there," the recipient is considered a **Shomer Chinnam** (unpaid guardian), even though he did not physically pick up the item. If one lends money and takes an item as collateral (**Mashkon**), the lender is a **Shomer Sakhar**. The *Mephasim* (commentators) explain this is because by holding the collateral, the lender is exempt from certain *mitzvot* (commandments), like giving charity to a poor person at the door, as he is occupied with guarding the collateral, and this "saved charity" is considered his payment. If one lends fruit and takes collateral, the lender is also a **Shomer Sakhar**. This is because fruit spoils, and by lending it out, the lender benefits by receiving fresh fruit in return, which is considered a form of payment for guarding the collateral. Finally, if one lends money to a poor person and takes collateral, the lender may rent out the collateral without informing the poor person and deduct the rental income from the loan. This is permissible because it is considered like returning a lost object (*Meshiv Aveda*), as the poor person could have rented it out himself.
The **Gemara** then raises a fundamental question: what is the halachic status of a renter (**Socher**)? The Torah explicitly defines the responsibilities of a **Shoel** (borrower), a **Shomer Chinnam** (unpaid guardian), and a **Shomer Sakhar** (paid guardian), but not a **Socher**. **Rabbi Yudah** holds that a **Socher** is a **Shomer Sakhar**. His reasoning is that if the renter had not paid, he would have been a **Shoel**, who has the highest level of responsibility. The act of paying for the use of the item reduces his responsibility to that of a **Shomer Sakhar**. **Rabbi Meir**, however, argues that a **Socher** is a **Shomer Chinnam**. He contends that the renter pays for the *use* of the item, not for guarding it, and therefore is not a paid guardian.
This creates an apparent contradiction with our **Mishnah**, which states that an *Uman* (craftsman) is a **Shomer Sakhar**. If **Rabbi Meir** considers a **Socher** a **Shomer Chinnam**, and an *Uman* is similar to a **Socher** (as both hold an item for their benefit, the **Socher** for use, the *Uman* for work), then the **Mishnah** would contradict **Rabbi Meir**. The **Gemara** attempts to resolve this by differentiating the *Uman* from the **Socher**. One explanation is that the *Uman* receives a benefit from the owner's trust in choosing him over other craftsmen, which is considered a form of payment, making him a **Shomer Sakhar**. Another explanation is that the *Uman* has the benefit (*hana'ah*) of being able to hold the item as collateral until he is paid for his work, guaranteeing his payment. This *hana'ah* elevates him to the status of a **Shomer Sakhar**. A **Socher**, on the other hand, is the one *paying* for the use, so he does not have this specific benefit.
Ultimately, the **Gemara** resolves the contradiction by suggesting a reversal of the opinions of **Rabbi Meir** and **Rabbi Yudah**. According to this revised understanding, **Rabbi Meir** holds that a **Socher** is a **Shomer Sakhar**, while **Rabbi Yudah** holds that a **Socher** is a **Shomer Chinnam**. This reversal allows our **Mishnah**, which states that an *Uman* is a **Shomer Sakhar**, to align with the opinion of **Rabbi Meir**, which is generally preferred for an unattributed **Mishnah** (a *Stam Mishnah*).