Reference for Chullin 185:31

חמשא חוטי הוו

When his father came and found him doing this, he said: Thus said your mother's father (that is, R'Jeremiah B'Abba) in the name of Rab: The Torah forbade only [the fat] at the top.<span class="x" onmousemove="('comment',' Lit., 'on the breast'; i.e., the membrane which lies over the thick part of the spleen. thb, thb, ht');">¹³</span>

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