Commentary for Chullin 185:28

חמשא חוטי אית ביה בכפלא תלתא מימינא ותרתי משמאלא תלתא מפצלי לתרי תרי תרי מפצלי לתלתא תלתא

R'Kahana (others say: Rab Judah) said: There are five membranes, three are forbidden on account of fat, and two on account of blood; that of the spleen, the loins, and the kidneys is forbidden on account of fat; that of the testicles and of the brain on account of blood.

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