Reference for Bava Metzia 38:8
אלא אמרינן ליה אנן האי כתבא לא יהבינן ליה להאי דלמא מכתב כתבת מיהב לא יהבת ניהליה ויהבתה לאיניש אחרינא וקא הדרת ביה אי לא יהבתה לאיניש אחרינא וקא בעית דתתבה להאי כתיב ליה השתא כתבא אחרינא ויהביה ניהליה דאי יהבת לאיניש אחרינא לית בה פסידא דקדים זכי
and then he changed his mind and did not give it to him; he then wrote another [document] for another person and gave it to him, but now he has made up his mind not to let him have it, and he argues [thus]: I cannot [legally] withdraw [the gift from him]. I will [therefore] tell them [the judges] that I gave it to this [person], so that they will return the document to him, and when he produces this earlier document he will be entitled [to the gift]. We therefore say to him [the donor]: We cannot give this document to this [person],<span class="x" onmousemove="('comment',' To whom he says the document should be returned. ');"><sup>3</sup></span>