Leviticus 9:8-10

King James Version

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

⁹ And 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:

¹⁰ But 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.