Reference for Bava Metzia 149:5

תני ר' חייא לסיועיה לרבי יצחק טיפת יין אין לו טיפת שמן אין לו הא יש לו לוה עליה כמה טיפין

BUT HE MAY SAY, 'LEND ME UNTIL MY SON COMES, OR UNTIL I FIND THE KEY.'<span class="x" onmousemove="('comment',' I.e., he has it, but it is temporarily inaccessible. Since the prohibition of lending a se'ah for a se'ah is only Rabbinical, it was not enacted when the borrower actually possesses the grain. ');">⁴</span>

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