Leviticus 3:3-5; Leviticus 3:16

3 'From the sacrifice of the peace offerings he shall present an offering by fire to the LORD , the fat that covers the entrails and all the fat that is on the entrails,

4 and the two kidneys with the fat that is on them, which is on the loins, and the lobe of the liver, which he shall remove with the kidneys.

5 'Then Aaron's sons shall offer it up in smoke on the altar on the burnt offering, which is on the wood that is on the fire; it is an offering by fire of a soothing aroma to the LORD .

16 'The priest shall offer them up in smoke on the altar as food, an offering by fire for a soothing aroma; all fat is the LORD'S.