Reference for Chullin 193:4
עובדא הוה קמיה דר' יוחנן בכנישתא דמעון בגדי שצלאו בחלבו ואתו ושיילוה לרבי יוחנן ואמר
R'Huna B'Judah suggested that it was the case of a kidney roasted with its fat, and he [R'Johanan] declared it to be permitted.<span class="x" onmousemove="('comment',' For the forbidden fat of the kidney could not penetrate the kidney by reason of the strong membrane which separates them.');"><sup>2</sup></span>
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