Related for Chullin 168:22
ומה מילה שודאה דוחה שבת אין ספיקה דוחה יו"ט כסוי שאין ודאו דוחה שבת אין דין שאין ספקו דוחה יו"ט
for even though in a case of certainty it does not override the Sabbath yet it does override the festival in a case of doubt.<span class="x" onmousemove="('comment',' For although only males and not females are bound to sound the Shofar it is nevertheless held that a tumtum, i.e., a person of doubtful sex, must sound the Shofar; thus it is seen that a case of doubt overrides the festival restriction.');"><sup>14</sup></span>
Tosefta Beitzah (Lieberman)
What is sourdough? Something that leavens other things. And what is leavened? Something that has been leavened by other things. From when is it called sourdough? As soon as it become unsuitable as dog food. One must not cover blood with ashes which burned [and thus created] during the holiday, because it does not count as something "prepared [before the holiday]". If one brought dust to plaster his roof, lime to whitewash his house, one uses it to cover. Rabbi Yose says: you can on a holiday not slaughter a koi because it is a doubt, and if one has slaughtered him, one does not cover his blood.
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