Leviticus 3:3-5, 16

He will present part of the fellowship sacrifice as a food offering to the LORD: the fat  surrounding the entrails,  all the fat that is on the entrails, and the two kidneys  with the fat on them at the loins; he will also remove the fatty lobe of the liver  with the kidneys. Aaron’s sons will burn it on the altar along with the burnt offering  that is on the burning wood, a food offering, a pleasing aroma to the LORD.

Then the priest will burn the food on the altar, as a food offering for a pleasing aroma.  “All fat belongs to the LORD.