Leviticus 3:3-4
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The Peace Offering
3Then he shall offer from the sacrifice of the peace offering an offering made by fire to the Lord. The fat that covers the entrails and all the fat that is on the entrails, 4the two kidneys and the fat that is on them by the flanks, and the fatty lobe attached to the liver above the kidneys, he shall remove;
Leviticus 3:3-4 (NKJV)