Reference for Bava Batra 350:12

(אלא) רבה טעמא דבני מערבא קאמר וליה לא סבירא ליה

If so, [the same law should apply] also [to] a verbal loan! — In that case the loan is not [sufficiently] known.<span class="x" onmousemove="('comment',' Lit., 'it has no voice'. ');">²⁰</span> Did Rabbah, however, give such [a ruling]?<span class="x" onmousemove="('comment',' Lit., 'say so', that the hypothecary obligation involved by debts is not Biblical. ');">²¹</span>

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