Reference for Bava Metzia 25:5
אביי אמר עדיו בחתומיו זכין לו ואפילו שטרי דלאו הקנאה
we do not write [the note of indebtedness]? — R. Assi answered: Although ordinarily we do not write notes which are not deeds of transfer, when the lender is not present, in our Mishnah, which [deals with a document that] has been dropped and has consequently become suspect, we do apprehend that by some chance it might have been written [in the absence of the lender]. Abaye says: The witnesses acquire for him<span class="x" onmousemove="('comment',' The lender. As soon as the witnesses have signed the document the borrower's property becomes legally liable to be seized by the lender, even if the money has not really been lent yet. There is therefore no fear of the lender seizing the borrower's sold property unlawfully, even if the document is an ordinary note of indebtedness. ');"><sup>4</sup></span>