Reference for Chullin 194:29

וכחל עצמו אסור ואי נפל לקדרה אחרת אוסר

R'Isaac the son of R'Mesharshey said: But the udder itself is forbidden,<span class="x" onmousemove="('comment',' Even though the pot contained sixty times the quantity of the udder, in which case everything else in the pot is permitted, the udder itself is forbidden, for the meat in the pot imparted its flavour into it.');">¹⁷</span>

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