Reference for Bava Metzia 195:3

רישא בב' דא"ל ב' פרות מסרתי לך פלגיה דיומא בשאילה ופלגיה דיומא בשכירות אי נמי חד יומא בשאילה וחד יומא בשכירות ומתו תרוייהו בעידן שאילה

'And the second clause, where three [cows are involved].' [Thus:] A said to B, 'I gave you three cows, two loaned and one hired, and the two loaned ones died.' To which the borrower replied, 'Tis true that one borrowed animal died; but as for the other, I do not know whether the borrowed one died and the one alive is the hired one, or the hired one died and the one alive is the borrowed;' since he cannot swear, he must pay.

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