Commentary for Menachot 123:21

ורבי סבר דון מינה ואוקי באתרה מה זבחי שלמי יחיד טעונין תנופה לאחר שחיטה אף זבחי שלמי צבור טעונין תנופה לאחר שחיטה ואוקי באתרה התם הוא דחזה ושוק אבל הכא כמות שהן כמות שהן בחיים

So Rabbi. But the Sages say, Only of the breast and thigh. Wherein do they differ? - R'Hisda said to R'Hamnuna (others say, R'Hamnuna said to R'Hisda) , They differ as to whether we say 'Deduce from it and again from it', or 'Deduce from it and establish it in its own place'.<span class="x" onmousemove="('comment',' Whenever a subject is inferred from another by means of analogy or by 'the common features' the question always arises as to the extent to which the inference must be carried. The rule 'deduce from it and again from it' clearly suggests that the two subjects must in the end be brought to absolute agreement on every point. On the other hand, 'deduce from it and establish it in its place' suggests that the inference is to be made with regard to one point only, and as for the rest each subject is regulated by the rules governing its other aspects.');">²⁵</span> The Rabbis maintain the principle, 'Deduce from it and again from it'. ['Deduce from it':] as the individual's peace-offering requires waving after it is slaughtered, so the peace-offerings of the community also require waving after they are slaughtered; and 'again from it': just as the waving there<span class="x" onmousemove="('comment',' The individual's peace-offering.');">²⁶</span> is of the breast and thigh, so here it is also of the breast and thigh. Rabbi, however, maintains the principle 'Deduce from it and establish it in its own place'. ['Deduce from it':] as the individual's peace-offering requires waving after it is slaughtered, so the peace-offerings of the community also require waving after they are slaughtered; and 'establish it in its own place': whereas there<span class="x" onmousemove="('comment',' The individual's peace-offering.');">²⁶</span> the waving is of the breast and thigh only, here it is of them as they are, that is, as they are when alive.

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