Midrash for Chullin 267:50
שמונה ספקות נאמרו בגר ארבע לחיוב וארבע לפטור
the dough-offering,<span class="x" onmousemove="('comment',' The doubt here being as stated in Mishnah Hal. III, 6. This case of doubt may involve the penalty of death at the hands of Heaven, v. supra n. 3.');"><sup>37</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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