Reference for Bava Kamma 123:5

אמר רב שמעית מילתא לר' יהודה ולא ידענא מאי היא אמר שמואל ולא ידע אבא מאי שמיע ליה לר' יהודה דמחייב על נזקי טמון באש עשו תקנת נגזל באשו

[So also where permission was granted] for the purpose of piling up stacks of wheat, and he piled up stacks of barley, or [permission was given for] barley and he piled up wheat, or even where he piled up wheat [for which the permission was granted], but covered it with barley, or again where he piled up barley but covered it with wheat; [in these cases] no payment would be made except for the value of the barley alone.<span class="x" onmousemove="('comment',' As where permission was granted for barley the owner of the field could not have expected that wheat would be piled up. Even where permission was given for wheat, if the stacks were covered with barley, the owner of the field can plead that he only noticed barley. ');">⁵</span>

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