Exodus 40:12-15

12 Then you shall bring Aaron and his sons to the entrance of the tent of meeting, and shall wash them with water,
13 and put on Aaron the sacred vestments, and you shall anoint him and consecrate him, so that he may serve me as priest.
14 You shall bring his sons also and put tunics on them,
15 and anoint them, as you anointed their father, that they may serve me as priests: and their anointing shall admit them to a perpetual priesthood throughout all generations to come.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.