Commentary for Bava Metzia 126:13

היכי דמי בכדי שהדעת טועה אמר רב אחא בריה דרב יוסף

if he possesses it, it is permitted; if not, it is forbidden. But this is obvious!<span class="x" onmousemove="('comment',' As various Baraithas have already stated. ');">¹²</span> — It is necessary [to teach this] only when he has [wax] credits in town:<span class="x" onmousemove="('comment',' I.e., he has already paid for stocks, which are now due to him. ');">¹³</span> I might think that in such a case it is as though [he had said, 'Lend me] until my son comes, or until I find the key:'<span class="x" onmousemove="('comment',' v. infra 75a; here too, I might regard it as being already in his possession, though temporarily inaccessible. ');">¹⁴</span> therefore he teaches, since it must yet be collected, it is as non-existent. R. Nahman also said: If one borrows money from his neighbour and found a surplus therein, if it is an amount about which there could be an error, he must return it; otherwise, it is simply a gift. When is it 'an amount about which there could be an error'? — R. Abba, the son of R. Joseph said:

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