Exodus 40:12-15

12“You are to bring Aaron and his sons to the entrance of the tent of meeting and wash them with water.

13Then you are to clothe Aaron with the holy garments and anoint him and sanctify him so that he may minister as my priest.

14You are to bring his sons and clothe them with tunics

15and anoint them just as you anointed their father, so that they may minister as my priests; their anointing will make them a priesthood that will continue throughout their generations.”