Reference for Bava Metzia 69:3

אי הכי כי משתבע מלוה נמי לטרח לוה וליתי בשלמא מלוה ידע מאן קא עייל ונפק בביתיה ואזיל וטרח ומייתי לה אלא לוה מי ידע מאן עייל ונפיק בביתיה דמלוה

If so, whence can he produce it? — But, said, R. Joseph, there are witnesses that it was stolen. Yet after all, whence can he produce it? He may exert himself and bring it. If so, when the creditor swears, the debtor may take pains and bring it! — [No.] As for the creditor['s producing it], it is well: he knows who enters and leaves his house, and so he can go, exert himself, and produce it. But does the debtor know who enters and leaves the creditor's house?

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