Exodus 40:12-16

12Then you shall bring Aaron and his sons to the entrance of the tent of meeting and shall wash them with water

13and put on Aaron the holy garments. And you shall anoint him and consecrate him, that he may serve me as priest.

14You shall bring his sons also and put coats on them,

15and 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 their generations."

16This Moses did; according to all that the Lord commanded him, so he did.