Leviticus 3:3-5, 9

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.

He will then present part of the fellowship sacrifice as a food offering to the LORD consisting of its fat and the entire fat tail,  which he is to remove close to the backbone. He will also remove the fat surrounding the entrails,  all the fat on the entrails