Exodus 29:9

6 and you shall set the turban on his head, and put the holy crown on the turban.

7 Then you shall take the anointing oil, and pour it on his head, and anoint him.

8 You shall bring his sons, and put coats on them.

9 You shall dress them with belts, Aaron and his sons, and bind headbands on them: and they shall have the priesthood by a perpetual statute: and 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.

11 You shall kill the bull before Yahweh, at the door of the tent of meeting.

12 You 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.