Related for Chullin 168:19
דתניא ר' יוסי אומר
yet in a case of doubt does not even override the festival,<span class="x" onmousemove="('comment',' If a child was born at twilight there is a doubt as to the correct day for circumcision, and the child is circumcised on the ninth day; should this day happen to be a festival the circumcision is postponed to the tenth day. V. Shab. ibid.');"><sup>11</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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