Exodus 29:11

9You shall clothe them with belts, Aaron and his sons, and bind headbands on them. They shall have the priesthood by a perpetual statute. You shall consecrate Aaron and his sons.

10“You shall bring the bull before the Tent of Meeting; and Aaron and his sons shall lay their hands on the head of the bull.

11You shall kill the bull before the LORD at the door of the Tent of Meeting.

12You shall take of the blood of the bull, and put it on the horns of the altar with your finger; and you shall pour out all the blood at the base of the altar.

13You shall take all the fat that covers the innards, the cover of the liver, the two kidneys, and the fat that is on them, and burn them on the altar.