Commentary for Pesachim 166:9
רב אשי אמר לא נצרכא אלא לשמנו דגיד הנשה דתניא שמנו מותר וישראל קדושים הם ונוהגין בו איסור
Why then do they [both] need burning? - Said R'Ika B'Hinena: [This law was stated] where e.g. , they were [originally] distinguished but subsequently mixed up.<span class="x" onmousemove="('comment',' R. Judah may be certain that the prohibition applies to the right thigh only, but these sinews referred to in our Mishnah, though distinguished when drawn out, are now mixed up and we do not know which is the right and which is the left, and hence both require burning.');"><sup>8</sup></span> R'Ashi said: It is necessary [to teach it] only in respect of the fat of the sinew of the thigh.
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