Reference 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');">³⁶</span>

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