Related for Chullin 168:21
מקל וחומר
They said to him: But the sounding of the Shofar in the provinces could prove otherwise,<span class="x" onmousemove="('comment',' It is established law that if Rosh Hashanah happened to fall on Sabbath the Shofar was blown in the Temple (or, in Jerusalem - Maim.) but not in any other place in the land of Israel. V. R.H. 29b.');"><sup>13</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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