Leviticus 3:3-5

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;

5and Aaron’s sons shall burn it on the altar upon the burnt sacrifice, which is on the wood that is on the fire, as an offering made by fire, a sweet aroma to the Lord.