Reference for Yoma 9:4

רב נחמן בר יצחק אמר תנופה איכא בינייהו למ"ד כל הכתוב בהן מעכב בהן מעכבא ולמ"ד דבר שאין מעכב לדורות אין מעכב בהן לא מעכבא

and it shall be accepted for him to make atonement for him'? To say that if he performed the laying on of the hands as an unimportant part<span class="x" onmousemove="('comment',' Lit., 'a remnant'.');">⁴</span> of the commandment, Scripture would account it to him as if he had not obtained proper atonement.<span class="x" onmousemove="('comment',' Lit., 'as it did not atone for him and it did'. Technically the ceremony had achieved its purpose, because essentially it is the blood which makes atonement, but since laying the hands on the animal's head is part of the ceremony (although not essential to it) and he has been negligent about it, he has obtained atonement for himself, but has not attained re-atonement with his creator, whose command he has treated slightingly.');">⁵</span>

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