Commentary for Yoma 64:14

יכול לא מירק יהא פסול אם כן הויא ליה עבודה באחר (ותנן) כל עבודות יום הכפורים אינן כשרות אלא בו הכי קאמר יכול יהא פסול מדרבנן

Thus also said R'Johanan: The bigger part of the two organs. Resh Lakish also holds that he cuts through the bigger part of the two organs, for Resh Lakish said:<span class="x" onmousemove="('comment',' Hul. 29b.');">²⁰</span> Since we have learned that the cutting through of the bigger part of an organ is as good as the cutting through the whole of it, why did we learn that 'the bigger part of one organ [is required to be cut through] in case of a fowl 'and the bigger part of the two organs [are required to be cut through] in case of an animal? Because we have learned: ONE BROUGHT HIM THE CONTINUAL OFFERING, HE MADE THE REQUIRED CUT AND SOMEONE ELSE FINISHED IT FOR HIM, HE RECEIVED THE BLOOD AND SPRINKLED IT-one might assume, if another one did not complete the killing for him, it would be invalid. - [You say that] 'one could assume that if the other did not complete the killing for him, it would be invalid,' then it would mean that the service is performed by someone<span class="x" onmousemove="('comment',' That would render the service of the other essential, hence would mean someone else's participation in the service of the Day of Atonement, which is against the law.');">²¹</span> else and we have learnt: All the services of the Day of Atonement are valid only if performed by him [the high priest]?<span class="x" onmousemove="('comment',' Infra 73a.');">²²</span> - Rather: This is what he says: One might have assumed that it shall be considered invalidated by Rabbinic ordinance,<span class="x" onmousemove="('comment',' Making a distinction between profane slaughter, where the bigger part of an organ is on the same level as the whole organ, i.e., the cutting through of the bigger part completes the slaughtering effectively, as against sacred animals, which would have their organ (or organs) completely cut through.');">²³</span>

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