Reference for Bekhorot 47:4

אשמעינן הלכה כר' יוסי לאשמועינן דאדרבן שמעון בן גמליאל קאי ופלוגתא דברייתא לאו פלוגתא היא

was that R'Jose stated two things [in the subsequent Mishnah]<span class="x" onmousemove="('comment',' One thing. that we make a clear space in the neck for the butcher's hatchet in order to kill the firstling, and secondly, that we tear the wool to show the blemish of a firstling.');">²</span>

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