Exodus 40:12-15

40:12 “You are to bring Aaron and his sons to the entrance of the tent of meeting and wash them with water. 40:13 Then you are to clothe Aaron with the holy garments and anoint him and sanctify him so that he may minister as my priest. 40:14 You are to bring his sons and clothe them with tunics 40:15 and 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.”