Leviticus 9:12

10But the fat, and the kidneys, and the caul above the liver of the sin offering, he burnt upon the altar; as the LORD commanded Moses.

11And the flesh and the hide he burnt with fire without the camp.

12And he slew the burnt offering; and Aaron’s sons presented unto him the blood, which he sprinkled round about upon the altar.

13And they presented the burnt offering unto him, with the pieces thereof, and the head: and he burnt them upon the altar.

14And he did wash the inwards and the legs, and burnt them upon the burnt offering on the altar.