Reference for Bava Metzia 67:13

ללישנא קמא דרב פפא ודאי לא הויא תיובתא ללישנא בתרא לימא תיהוי תיובתיה

It has been taught in accordance with R. Zebid. If one borrows a cow from his neighbour and it is stolen, and the borrower hastens and pays for it, and then the thief is found, he must repay double to the borrower. Now, on the first version of R. Papa's dictum,<span class="x" onmousemove="('comment',' According to which the borrower does not acquire the double payment by his mere promise to pay. ');">¹¹</span>

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