Related for Bekhorot 65:20
מ"ט דב"ש
What is the reason of Beth Shammai? - Scripture writes [with reference to a firstling]: 'And the flesh of them shall be thine [as the wave-breast and as the right shoulder]':<span class="x" onmousemove="('comment',' Num. XVIII, 18.');"><sup>11</sup></span>
Tosefta Beitzah (Lieberman)
One must not flay the legs of a slaughtered animal on the holiday. And one must not flay the legs of a slaughtered animal on the working day, if it is a firstborn or a sacred animal that has become unfit acts. You can do anything for circumcision on a holiday necessary to do; Things that one is not allowed to do on the Sabbath, one may also do on the holiday: He may grate cumin and mix wine with oil. Rabban Shimon ben Gamliel says: Only he shall not first tear canvas to rags.
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