Reference for Chullin 220:19

דילמא התם בכבדא דאיסורא

Then you should have no more doubts as to whether it renders others forbidden, for we have learnt: The liver renders [other pieces in the pot] forbidden but is not itself rendered forbidden, for it exude and does not absorb'!<span class="x" onmousemove="('comment',' Ter. X, 11.');">⁴</span> - He replied.' Perhaps there it refers to the liver of a forbidden [animal]

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