Midrash for Chullin 267:48
ספק איסורא לחומרא ספק ממונא לקולא
we must take the more stringent view, where the doubt concerns a monetary matter we take the more lenient view.<span class="x" onmousemove="('comment',' The priestly dues are in no wise sacred and the omission to give them does not render the animal forbidden; consequently, it is only a monetary consideration, and in a case of doubt it is for the priest, the claimant, to establish his claim.');"><sup>35</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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