Midrash for Chullin 267:27
תנן ספק פטור
belongs to the owner;<span class="x" onmousemove="('comment',' The law of gleanings does not apply to it, for it is certain that the grain was carried into the holes by ants and did not fall therein at the time of reaping, since that part of the field has not yet been reaped.');"><sup>21</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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