Reference for Bava Batra 11:2

היכי דמי אילימא שתבעו לאחר זמן ואמר לו פרעתיך בזמני פשיטא אלא לאו דאמר ליה פרעתיך בתוך זמני אלמא אפילו במקום חזקה אמרינן מה לי לשקר שאני הכא דכל שפא ושפא זמניה הוא

Then this is self-evident. We must suppose then that he pleads, I paid you before the time of payment; from which we would infer that even where there is a presumption against the defendant, we plead [on his behalf], What motive has he to tell a lie? The case here is different, because with every layer [that is finished some] payment becomes due.<span class="x" onmousemove="('comment',' And therefore he does not really plead that he paid before the time. ');">²</span>

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