Reference for Chullin 36:34

(מלכים א ב, כה) ויפגע בו וימת או דלמא פגע ולא נגע כדכתיב

Mar son of R'Ashi said: If the knife reached the arytenoid cartilages the slaughtering is valid; if, however, [the knife cut through the arytenoid cartilages,] leaving part of them [on the side of the head] the slaughtering is invalid.<span class="x" onmousemove="('comment',' According to the interpretation of Tosaf. (v. supra p. 92, n.7) this statement of Mar b. R. Ashi must be reversed thus: If the knife reached the cartilages (i.e., cut beyond or above them) the slaughtering is invalid, but if it cut through them the slaughtering is valid. This view is also accepted by Maim. in Yad, Shechitah, III, 12.');">²⁰</span>

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