Responsa for Bava Metzia 130:4
תני רב ספרא ברבית דבי רבי חייא פעמים ששניהם מותרין פעמים ששניהם אסורין ופעמים שהמוכר מותר ולוקח אסור ופעמים שהלוקח מותר ומוכר אסור
<b><i>MISHNAH</i></b>. IF A MAN SOLD A FIELD, AND HE [THE BUYER] HAVING PAID PART OF THE PURCHASE PRICE, THE VENDOR PROPOSED, 'WHENEVER YOU DESIRE, BRING ME THE BALANCE AND TAKE YOUR OWN' [SC. THE FIELD], THAT IS FORBIDDEN.<span class="x" onmousemove="('comment',' Rashi: When the balance is paid, the field shall have belonged to the buyer from the time of purchase. Now, should the vendor take the usufruct, when the balance is paid, he has enjoyed that which really belonged to the purchaser, and it looks like interest on the balance, for which he waited. On the other hand, should the purchaser take its profits from the time of the deposit and never complete the transaction, the deposit being returned, he has thus received interest on it. ');"><sup>4</sup></span>
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