We begin with a very important case: a Jew bought a field from a non-Jew, who in turn had bought it from another Jew. Let's name them: Reuven buys a field from a non-Jew, who supposedly bought it from Shimon. Now, Reuven is on the field. What is the ruling? The principle states: "A Jew who comes through a non-Jew, he is like the non-Jew." What does this mean? It means that just as a non-Jew has no law of presumptive ownership for land—even if a non-Jew lives on a field for three years, we do not say he has established presumptive ownership; he must produce a deed to prove his claim—so too, a Jew who comes to possess land through a non-Jew does not acquire presumptive ownership merely by occupying the field for three years. He must produce a deed.
In our scenario, if Shimon, the original owner, comes to Reuven and says, "That's my field," and Reuven responds, "The non-Jew was living on the field for three years, so he had presumptive ownership, and I bought it from him," this claim is insufficient. The non-Jew cannot establish presumptive ownership, and therefore, Reuven, who acquired the field from the non-Jew, also cannot rely on the non-Jew's prior occupancy. Reuven must produce a deed proving that Shimon sold the field to the non-Jew. Without such a deed, Reuven's presumptive ownership is not enough, and he must return the field to Shimon. Reuven would then have to confront the non-Jew to reclaim his money.
The reason for this ruling is that the underlying principle of presumptive ownership relies on the original owner's silence implying consent. However, an owner might be afraid to protest against a non-Jew. Therefore, the owner's silence when a non-Jew occupies his field for three years does not constitute an admission of the non-Jew's ownership. This same logic applies to a Resh Galut (Exilarch). If a Resh Galut occupies a property for three years, it does not establish presumptive ownership, because people are afraid to protest against the Resh Galut. Consequently, their silence cannot be interpreted as consent.
The Gemara then presents a nuance: Rav Yehuda states that if the Jew who bought the field from the non-Jew says, "When I bought it from the non-Jew, he told me that he bought it from you (the original Jewish owner)," then he is believed. This credibility stems from the argument of *migo* (since he could have said). He could have claimed, "I bought it directly from you," which would be a stronger claim. Since he chose a weaker, but still plausible, claim, he is believed regarding the non-Jew's statement. However, the Gemara questions this, arguing that if the non-Jew himself would not be believed to say, "I bought it from the Jew," without a deed, then why should the Jew who heard it from the non-Jew be believed?
The Gemara clarifies: this applies if the Jew says, "I saw with my own eyes that you (the original owner) sold the property to the non-Jew." In this case, he is believed to keep the field even without a deed, because of the *migo*. He could have simply lied and said he bought it directly from the original owner. By stating he witnessed the sale to the non-Jew, his claim is considered credible. The Rishonim even suggest that once he states he witnessed the sale, a *migo* might not even be strictly necessary; his direct testimony serves as a strong claim of presumptive ownership.
The Gemara continues with other cases where presumptive ownership is not established. Rav Yehuda states that if a person is seen with a sickle and a rope (tools for harvesting dates), saying he is going to cut dates from a certain tree, he is believed to own the tree. This is because such an act is brazen; if he didn't own it, he wouldn't announce his intention to steal. However, this is not the focus of our current discussion.
Another case: if someone establishes presumptive ownership on the external part of a field, a "place where animals are," it is not considered valid presumptive ownership. This refers to the periphery of a field where the owner might scatter some seeds but doesn't tend to it, and wild animals typically eat whatever grows there. If someone occupies such a parcel for three years, it's not presumptive ownership. Why? Because the owner has no reason to protest. What is the occupier gaining? The animals eat everything anyway. The owner's silence in this scenario is not an admission of ownership, but rather indifference to an activity that yields no benefit. Similarly, if someone eats from *orla* (fruit from a tree in its first three years, which is forbidden), or from produce of the Sabbatical year (*shemitah*), or from *kilayim* (forbidden mixtures), for three years, and the owner does not protest, it is not considered presumptive ownership. In these cases, the occupier is not benefiting in a permissible way, so the owner has no reason to protest. His silence is not consent.
However, Rav Yehuda states that if someone eats *shachat* (stubble) from a field for three years, it is not presumptive ownership. The owner doesn't protest because he doesn't want the stubble; he wants the wheat to grow. The occupier's act of eating stubble suggests he's afraid to let the wheat ripen, indicating he knows the field isn't his. The owner's silence is not consent but an observation of the occupier's fear. But, if this occurs in the valley of Mehoza, where people were wealthy and used stubble to feed their many animals, eating *shachat* was a normal usage of a field. In such a place, if the owner doesn't protest, it *is* considered presumptive ownership after three years.
Furthermore, if someone occupies *tafteeha* (inferior, broken land not suitable for planting) for three years, it is not presumptive ownership. The owner doesn't protest because the land yields very little, if anything. His silence is due to the land's poor quality, not an agreement to ownership. Similarly, if a Resh Galut occupies our land for three years, it's not presumptive ownership because people are afraid to protest. Conversely, if we occupy the Resh Galut's property for three years, it is also not presumptive ownership. The Resh Galut, being wealthy, might not mind someone working their field, viewing it as free labor, and thus their silence isn't consent to transfer ownership.
The discussion then shifts to movable property. For a slave (*avad*), presumptive ownership is established after three years, just like land. However, for animals like sheep (*gidorot*), there is no immediate presumptive ownership. If someone possesses an animal, the original owner can claim it simply walked into the possessor's backyard. Animals roam freely, so mere possession doesn't prove ownership. A slave, however, is considered like land in this regard: after three years of unchallenged possession, presumptive ownership is established. The Gemara clarifies that while a slave roams, after three years of unchallenged possession, the owner's silence implies consent, unlike an animal where the "roaming" argument always remains viable.
What if the slave is a baby in a crib, unable to move? In this case, possession should immediately establish presumptive ownership, as it couldn't have walked there. The Gemara states this is obvious. However, the case is nuanced: it refers to a baby slave who has a mother. One might argue the mother brought the baby there. But the Gemara rejects this, stating a mother does not forget her child for three years. Therefore, even a baby slave with a mother, if found in someone's possession, establishes immediate presumptive ownership, as the mother would have reclaimed it if it were hers.
Another case involves goats (*ezek*) eating barley (*chushla*) from a field. If the owner of the barley seizes the goats and claims the goat owner owes him more than the goats are worth, Shmuel's father states he is only believed up to the value of the goats. This is because the barley owner has a *migo*: he could have simply claimed the goats were his, as they were on his property. Since he could have made a stronger claim (ownership of the goats), he is believed for the lesser claim (the value of the goats). However, more than the goats' value, he is not believed. The Gemara questions this *migo*, noting that animals roam, so presumptive ownership isn't immediate. Why would he have a *migo* to claim the goats are his?
The Gemara explains that goats are different from sheep because they are "always with a shepherd." This means they are not left to roam freely; they are always supervised. Therefore, if goats are found on someone's property, it implies they were acquired through sale, not just by wandering in. Thus, the barley owner *does* have a *migo* to claim he bought the goats. Rabbi Gabriel adds that in the region of Har B'A, where there are many robbers (*gazlanim*), animals are never left alone. They are always handed from owner to shepherd and back. So, if goats are found on someone's property, it must be by legitimate acquisition, reinforcing the *migo*.
We then return to the dispute between Rabbi Ishmael and Rabbi Akiva regarding the duration of presumptive ownership for a rain-fed field. Rabbi Ishmael requires 18 months, while Rabbi Akiva requires 14 months. The Gemara initially suggests their dispute is about whether plowing (*nir*) constitutes presumptive ownership. If plowing alone is presumptive ownership, then only one day of plowing in the first year, 12 months for continuity, and one day in the third year would suffice. However, the Mishnah's requirement of months (3, 12, 3 or 1, 12, 1) indicates that plowing alone is not enough; actual produce is needed.
The Gemara concludes that the dispute between Rabbi Ishmael and Rabbi Akiva is whether presumptive ownership requires a full, ripened crop (*pirah rabah*) or if even a small growth like stubble (*pirah zutra*) is sufficient. Rabbi Ishmael requires a full growth, which takes three months for certain crops like barley, rye, and lentils. Rabbi Akiva, however, considers even stubble, which takes only a month to grow, as sufficient for presumptive ownership. The Gemara clarifies that the first opinion, "plowing is not presumptive ownership," is correct, as the owner might allow someone to plow his field, essentially softening the ground for him, without implying transfer of ownership. His silence is not consent but a benefit.
The people of Pum Nahara sent a question to Rab Nahman and Rab Hizda: Is plowing considered presumptive ownership? Rav Acha, with the support of other great scholars (*gedolim*), holds that plowing *is* presumptive ownership. His reasoning is that an owner would not allow someone to plow his field and remain silent; such silence would imply consent. However, the Gemara points out that this position contradicts our Mishnah, which requires months of growth, not just days of plowing. The Mishnah's requirements of 18 or 14 months clearly indicate that plowing alone is not sufficient.
The Gemara then seeks to identify the sources for the view that plowing is not presumptive ownership. It cites Rav, who, in explaining the Sages' opinion, stated that three full years are required for presumptive ownership, excluding the idea that a single day of plowing would suffice. This implies Rav held that plowing is not presumptive ownership. Similarly, Shmuel, in explaining the Sages' view, said that three crops are needed (three harvests of dates, grapes, or olives). This also implies that plowing alone is not enough; actual produce is required. The difference between Rav and Shmuel's understanding of the Sages is subtle: Rav emphasizes three full years from day to day, while Shmuel emphasizes three cycles of crops, which could, in the case of a young palm tree, occur in less than three full years. The final ruling is that plowing is not considered presumptive ownership.