Exodus 40:12-15

ISV(i) 12 Then you are to bring Aaron and his sons to the doorway of the Tent of Meeting, and wash them with water. 13 You are to clothe Aaron with the holy garments, you are to anoint him, and consecrate him so he may serve me as priest. 14 You are to bring his sons and clothe them with tunics. 15 You are to anoint them just as you anointed their father so they may serve me as priests. Their anointing is to qualify them to belong to a perpetual priesthood from generation to generation.”