Midrash for Chullin 267:44
הכא פרה בחזקת פטורה קיימא קמה בחזקת חיובא קיימא
Said Abaye to him: Behold the case of the dough [of a proselyte, of which we learnt]:<span class="x" onmousemove="('comment',' Hal. III, 6.');"><sup>32</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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