Reference for Chullin 221:13

ומנו רב בר שבא אמר להו רב נחמן

Papa once suggested to Raba that the vinegar [in which the liver was dipped] should be forbidden, but Raba answered him thus: If the vinegar is forbidden then it [the liver] too should be forbidden, for just as it exudes [its juice into the vinegar] it will later on absorb it.<span class="x" onmousemove="('comment',' In truth, however, the effect of the vinegar is to harden the liver and close up its pores so that nothing at all can exude from it; this being so, the vinegar is also permitted. tehka');">⁸</span>

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