Reference for Gittin 33:7
אמר ליה רבי אסי אלא מעתה רישא דקתני שנים אומרים בפנינו נכתב ואחד אומר בפני נחתם פסול ורבי יהודה מכשיר טעמא דאין הגט יוצא מתחת ידי שניהם הא גט יוצא מתחת ידי שניהם מכשרי רבנן
to the writing and two to the signing. If, however, it is produced by the witnesses to the signing [as bearers], [the Get] is invalid. This would show, [would it not,] that he is of opinion that if two [bearers] bring a Get from 'foreign parts', they are required to declare, 'It was written in our presence and signed in our presence'? Said R. Assi to him: Accepting this view, look at the preceding clause: IF TWO SAY, 'IT WAS WRITTEN IN OUR PRESENCE' AND ONE SAYS, 'IT WAS SIGNED IN MY PRESENCE', IT IS INVALID: R. JUDAH, HOWEVER, DECLARES IT VALID. Do the Rabbis declare it invalid even if the Get is produced by both [as bearers]? — He replied: That is so. At another time R. Assi found R. Ammi poring [over the Mishnah] and saying that even if the Get [is produced] by the witnesses to the signing [as bearers],<span class="x" onmousemove="('comment',' And not the witness to the writing. ');"><sup>7</sup></span>