Reference for Zevachim 11:9

אמר רב ששת בריה דרב אידי מסתברא דלא כיפרו דאי סלקא דעתך כיפרו שני למה הוא בא

and he who gives terumah of his own for another man's produce, the goodwill is his!<span class="x" onmousemove="('comment',' I.e., he (so. the man who gives it) can give it to any priest he desires. If money is offered for the terumah to be given to a particular priest, that money belongs to him.');">⁷</span>

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