Leviticus 3:14-16

14He will present part of his offering as a food offering to the Lord: the fat surrounding the entrails, all the fat that is on the entrails,

15and the two kidneys with the fat on them at the loins; he will also remove the fatty lobe of the liver with the kidneys.

16Then the priest will burn the food on the altar, as a food offering for a pleasing aroma. “All fat belongs to the Lord.