Exodus 40:12-16

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

And you shall put the holy garments on Aaron and anoint him and consecrate him, so that he may serve as a priest to Me.

You shall also bring his sons and put tunics on them;

and you shall anoint them just as you have anointed their father, so that they may serve as priests to Me; and their anointing will qualify them for a permanent priesthood throughout their generations.”

So Moses did these things; according to all that the Lord had commanded him, so he did.