Reference for Chullin 98:5

ר"ע אומר

this, says R'Ishmael, teaches: as the fat upon the inwards [is characteristic in that it] is covered with a membrane which can be easily peeled off, so all fat [which is to be forbidden] must be covered with a membrane which can be easily peeled off.<span class="x" onmousemove="('comment',' According to this definition the prohibition includes the fat that is upon the abomasum and also the fat upon the duodenum, thus contradicting the preceding statement of R. Ishmael that the fat upon the abomasum is permitted.');">³</span>

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