Reference for Ketubot 26:4

ואי אשמעינן בההיא בההיא קאמר רבי יהושע אבל בהא אימא מודה לר"ג צריכא

And if it had told us only this case, I might have said that only in this case did R. Joshua say that she is not believed, but in that case I might say that he agrees with Rabban Gamaliel; therefore it was necessary to state both cases.

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