1. The Gemara derives from the sale of the Machpelah Cave that big trees are not included in the sale of a field.
2. Rav Mesharshiya: We learn from the sale of the Machpelah Cave that the borders themselves are included in the sale.
3. Rav Yehudah states what should be written in the sale document of a field.
4. The Gemara discusses a case of a person who sold "land and grown trees."
5. The Gemara discusses a case of a person who sold "land containing trees."
A BIT MORE
1. The verse details the borders of the "field" that Efron sold to Avraham. This indicates that only something that requires clear borders in order to know exactly where it is included in the sale of a field, as opposed to a well-known large tree that does not require such borders.
2. This is because the trees, which were the borders of the field and cave, were included in the sale.
3. He says that it is appropriate to write explicitly that he is including large and small trees. Even though these would be included in the sale even if he did not write them, it is a clearer and better sale document when they are explicitly stated.
4. If he has grown trees on his land, he must give two of these trees to the buyer. If he has no trees, he must buy two trees and give them to the buyer.
5. If the land contains no trees, the sale is invalid, as it does not match the description of the property.