Exodus 29:10-14

10"Then you shall bring the bull before the tent of meeting. Aaron and his sons shall lay their hands on the head of the bull.

11Then you shall kill the bull before the Lord at the entrance of the tent of meeting,

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

13And you shall take all the fat that covers the entrails, and the long lobe of the liver, and the two kidneys with the fat that is on them, and burn them on the altar.

14But the flesh of the bull and its skin and its dung you shall burn with fire outside the camp; it is a sin offering.