Related for Chullin 168:32
מאי ודאו דכסוי דלא דחי שבת לאו השוחט לחולה בשבת
so the case of the covering up of the blood must not have involved the transgression of a precept.<span class="x" onmousemove="('comment',' I.e., the slaughtering was a permissible act, for it was done for an invalid.');"><sup>20</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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