Leviticus 3:3-5

3He 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,

4and the two kidneys with the fat on them at the loins; he will also remove the fatty lobe of the liver with the kidneys.

5Aaron’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.