Midrash for Chullin 267:49
דאמר רב חסדא וכן תני ר' חייא
For R'Hisda stated, and so also did R'Hiyya teach: Eight cases of doubt were cited in connection with a proselyte, in four he is held liable and in four he is held exempt; and these are they: with regard to his wife's sacrifice,<span class="x" onmousemove="('comment',' Where there was a doubt whether his wife gave birth to a child before she became a proselyte or after. This case of doubt may involve a penalty of kareth, for if she gave birth after she became a proselyte she would then be obliged to bring a sacrifice consequent upon her childbirth');"><sup>36</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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