Reference for Gittin 54:1
בזמן שהבעל מודה מיהת יחזיר לאשה ואפי' לזמן מרובה ומשני כאן במקום שהשיירות מצויות כאן במקום שאין השיירות מצויות
that when the husband acknowledges it he should give it to the woman, even if a long time has elapsed? — R. Zera answered himself by saying that [in the Mishnah] here we speak of a place where caravans pass frequently and there [the other passage] of a place where caravans do not pass frequently. Some add [in quoting the answer of R. Zera]: And even [the Mishnah says] it should not be delivered only if there are presumed to be two men of the same name, which is the view of Rabbah. Some again report R. Zera as having said 'even though there are not presumed etc., he should not deliver,' and so as differing from Rabbah. We can understand why Rabbah did not raise the difficulty in the form in which it was raised by R. Zera: he thought there was more force in opposing one Mishnah to another.<span class="x" onmousemove="('comment',' Viz., our Mishnah and the Mishnah from Baba Mezi'a. ');"><sup>1</sup></span>