Exodus 40:12-16

12Then you shall 1bring Aaron and his sons to the doorway of the tent of meeting and wash them with water. 132You shall put the holy garments on Aaron and anoint him and consecrate him, that he may minister as a priest to Me. 14You shall bring his sons and put tunics on them; 15and you shall anoint them even as you have anointed their father, that they may minister as priests to Me; and their anointing will 3qualify them for a 4perpetual priesthood throughout their generations.” 16Thus Moses did; according to all that the Lord had commanded him, so he did.