Reference for Bekhorot 67:28

הלכה כר' יהודה ושמואל אמר

- Rather you must say that it refers to the R'Simeon of the Baraitha.<span class="x" onmousemove="('comment',' Who says that one may even slaughter the firstling on account of the blemish caused unintentionally.');">¹⁴</span>

Jastrow