Midrash for Chullin 267:28
אלמא ספיקא לקולא
[as for the grain found in ant-holes] behind the reapers,<span class="x" onmousemove="('comment',' According to R. Samson of Sens, if only the reapers have started to reap even though they have not reached the standing corn around the ant-holes; q.v.');"><sup>22</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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