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1. If a dying man says on his deathbed that someone should have "a share in his possessions," the beneficiary receives half of the estate.
2. If a Levi sells a field to a Yisrael on condition that he, the Levi, will receive the Ma'aser Rishon from the field's produce, the sale and condition are valid.
3. If the buyer sells this field (#2) to a third party and then buys it back, he is no longer required to give Ma'aser to this Levi.
4. Reish Lakish: A seller of a house may sell on condition that he is not including the top floor.
5. Rav Zevid and Rav Papa argue about what exactly Reish Lakish meant by making this seemingly obvious statement.
A BIT MORE
1. The term "a share" ("Palga") implies half of the possessions.
2. If the Levi says that the sale is on condition that he and his sons will receive the Ma'aser Rishon, the Yisrael must give the Ma'aser Rishon to the sons after the father dies.
3. Since the field was sold to a new buyer who did not have such a condition (to give the Levi, the original seller, the Ma'aser), the first buyer -- who now buys the field back from the second buyer -- is also not bound to give the Ma'aser to the Levi (even though he was the original purchaser from the Levi).
4. The Gemara asks why Reish Lakish bothered to say this when this essentially was already stated by a Mishnah.
5. Rav Zevid: He meant that the seller has the right to extend ledges from his top floor over the yard of the house that he sold to this buyer. Rav Papa: He may even build another floor on top of the top floor.
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