Commentary for Kiddushin 86:4
מאי קסבר אי קסבר המלוה חבירו בעדים צריך לפורעו בעדים הני נוגעים בעדות נינהו דאי אמרי לא פרעניה אמר להו פרעוני
are interested witnesses, for should they say: 'We did not repay him,' he [the debtor] can say to them, 'Then pay me!'<span class="x" onmousemove="('comment',' For he may have entrusted them the money before witnesses, which is the same as lending it to them. Hence they are personally concerned, and as such, inadmissible as witnesses. Cur. ed. proceed: But after all, he holds, etc. BAH gives the following version: Whilst if he holds that he who lends money to his neighbour before witnesses need not repay him before witnesses, what is the purpose of these witnesses? - But after all, he holds that when one lends money to his neighbour before witnesses he need not repay him before witnesses. Now, if he pleads, 'I myself repaid you,' that indeed is so (and further witnesses are not required) . The circumstances here are that he pleads, 'I repaid you by an agent,' and for that very reason he requires witnesses. Whilst the witnesses themselves (who in this case are alleged to have been entrusted with the money for repayment) , since they can plead, etc., (continuing as in our text) .');"><sup>6</sup></span> - But after all, he holds that he who lends money to his neighbour before witnesses need not repay him before witnesses, and since they can plead.' We returned it to the debtor,' they can also testify, 'We repaid the creditor.'