Exodus 29:10

7 Then take the oil and put it on his head.

8 And take his sons and put their robes on them;

9 And put the linen bands round Aaron and his sons, and the head-dresses on them, to make them priests by my order for ever: so you are to make Aaron and his sons holy to me.

10 Then let the ox be taken in front of the Tent of meeting: and let Aaron and his sons put their hands on its head.

11 And you are to put the ox to death before the Lord at the door of the Tent of meeting.

12 Then take some of the blood of the ox, and put it on the horns of the altar with your finger, draining out all the rest of the blood at the base of the altar.

13 And take all the fat covering the inside of the ox, and the fat joining the liver and the two kidneys with the fat round them, and let them be burned on the altar;