Reference for Chullin 267:45

אמר ליה אביי

If it was mixed before he became a proselyte he is exempt from giving the dough-offering; if after he became a proselyte, he is liable to give it; if there was a doubt about it, he is liable!<span class="x" onmousemove="('comment',' Even though at the time when the doubt arises the dough has the status of exemption from the dough-offering, for the dough of a gentile is exempt; this clearly conflicts with Raba's contention.');">³³</span>

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