Related for Chullin 168:18
אשתומא קאמר לישמטוה לאמוריה מיניה
A koy may not be slaughtered on a festival, and if it was slaughtered its blood may not be covered up, by reason of the following a fortiori argument: If circumcision which in a case of certainty overrides the Sabbath<span class="x" onmousemove="('comment',' If the eighth day is a Sabbath, the child is circumcised on the Sabbath, for the rite of circumcision overrides the laws of Sabbath. V. Shab. XIX, 5.');"><sup>10</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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