Leviticus 9:10

8Aaron therefore went unto the altar, and slew the calf of the sin offering, which was for himself.

9And the sons of Aaron brought the blood unto him: and he dipped his finger in the blood, and put it upon the horns of the altar, and poured out the blood at the bottom of the altar:

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.