For the source text click/tap here: Bava Metzia 109
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Our Daf cites a Beraisa which teaches that when the Yovel year arrives, any field that was purchased must be returned to its original owner, but the purchaser is not required to "return" the improvements that he made to the field (and thus when he returns the field, the original owner must pay him for the improvements). The Gemara attempts to derive from this law that when a sharecropper ("Mekabel") finishes his work, the owner of the land is similarly obligated to pay him for any improvements that he made to the land.
We explore the radical innovation of Yovel.