Reference for Kiddushin 104:7

אבל הכא משום כיסופא הוא דעבד ואינה מקודשת

And how does on know whether he resents it as theft or not? If the owner comes and finds him, and says to him, 'Go to the better [produce]': and better [crops] are found, the separation is valid;<span class="x" onmousemove="('comment',' For this proves that he meant what he said.');">¹³</span> if not, it is invalid.<span class="x" onmousemove="('comment',' For he thus sarcastically shewed his resentment. Now, this criterion applies only to terumah, since it must be separated in any case.');">¹⁴</span>

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