Reference for Sanhedrin 60:25
אמר רבא מסתברא מילתיה דרב יהודה באחד אומר בארנקי שחורה ואחד אומר בארנקי לבנה אבל אחד אומר מנה שחור ואחד אומר מנה לבן אין מצטרפין
R. Nahman b. Isaac, on meeting R. Huna the son of R. Joshua, asked him: Whereindoes a loan after a loan differ, so that it [the testimony] is not [combined]:because the [loan of a] <i>maneh</i> witnessed by one is not the same as that witnessedby the other? Then the same applies to an admission after an admission: the[debt of a] <i>maneh</i> which he admitted in the presence of one witness may notbe the same as that which he admitted before the other witness! — It meansthat he declared to the latter (witness): 'Regarding the <i>maneh</i> which I haveadmitted in your presence, I have also made an admission in the presenceof so and so.' Yet even then, only the latter would know [this], but notthe former? — He [subsequently] went again and said to the first witness:'The <i>maneh</i> which I admitted receiving in your presence, I also admitted receivingin the presence of so and so.' Thereupon [R. Nahman] said to him [R. Hunathe son of R. Joshua]: 'May your mind be at ease as you have made mine.'Said he, 'Why at ease?' Did not Raba — others say, R. Shesheth — hurl ahatchet at this [answer];<span class="x" onmousemove="('comment',' I.e., disproved the opinion. ');"><sup>26</sup></span>