Reference for Bava Kamma 123:7

אלא כי תבעי לך אליבא דמ"ד דיינינן דינא דגרמי עשו תקנת נגזל במסור דמשתבע ושקיל או לא תיקו

she would have to pay only for a silver <i>denar</i>, as she could [rightly] plead against him: 'It was only silver that I undertook to take care of, but I never undertook to take care of gold.' Said R. Mordecai to R. Ashi: 'Do you state this in the name of Raba? We derive it quite definitely from the Baraitha [which states]: [If a man piled up] wheat [for which the permission was granted], but covered it with barley, or again [if he piled up] barley but covered it up with wheat, no payment would be made except for the value of the barley alone. Now, does this not prove that he is entitled to plead against the plaintiff: 'It was only barley that I undertook to take care of?' Here too she is surely entitled to plead against the depositor, 'I never undertook to take care of gold.'

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