Reference for Chullin 194:34

אלא מעתה נפל לקדרה אחרת לא יאסר

- Since R'Isaac the son of R'Mesharsheya had said that the udder itself was forbidden, the Rabbis declared it to be as a piece of nebelah.<span class="x" onmousemove="('comment',' The neutralization in the first pot only came about gradually, so that before there was the necessary sixty-fold it was forbidden; accordingly the forbidden substance is always regarded as a piece of nebelah which renders forbidden the contents of any and every pot into which it fell.');">²¹</span>

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