Midrash for Chullin 267:47
אמר ליה
Where the doubt concerns a religious prohibition<span class="x" onmousemove="('comment',' For if the dough-offering is not given to the priest the whole dough is deemed to be tebel and forbidden to be eaten on the penalty of death at the hands of Heaven.');"><sup>34</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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