Reference for Pesachim 31:13

וצריכי דאי אשמעינן בתלושין משום דאחשבינהו אבל מחוברין אימא לא

Said R'Shisha the son of R'Idi: Let it be compared to the fourth degree in the case of sacred [food].<span class="x" onmousemove="('comment',' I.e. , sacrifices. V. p. 62, n. 2. Thus there too it is unfit itself through defilement, yet cannot defile other flesh of sacrifices.');">¹⁶</span> To this R'Ashi demurred: A fourth degree in the case of sacred [food] is not designated unclean, [whereas] this is designated unclean? - This is a difficulty.

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