Leviticus 3:3-5, 16

The priest must present part of this peace offering as a special gift to the LORD. This includes all the fat around the internal organs, the two kidneys and the fat around them near the loins, and the long lobe of the liver. These must be removed with the kidneys, and Aaron’s sons will burn them on top of the burnt offering on the wood burning on the altar. It is a special gift, a pleasing aroma to the LORD.

and the priest will burn them on the altar. It is a special gift of food, a pleasing aroma to the LORD. All the fat belongs to the LORD.