Leviticus 3:3-4
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3And he shall offer of the sacrifice of peace-offerings an offering made by fire unto Jehovah; the fat that covereth the inwards, and all the fat that is upon the inwards, 4and the two kidneys, and the fat that is on them, which is by the loins, and the caul upon the liver, with the kidneys, shall he take away.
Leviticus 3:3-4 (ASV)