Midrash 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.');"><sup>33</sup></span>
Sifrei Devarim
"from the slaughterers of the slaughtering": The time of the slaughtering is the criterion. From here they ruled: If a stranger converted and he had a cow — If it were slaughtered before he converted, he is exempt (from priestly gifts); if after he converted, he is liable. If the matter is in doubt (safek), he is exempt, and "the burden of the proof is upon him who would remove (the object) from his neighbor's domain.
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