Exodus 40:12-15

“Then you shall bring Aaron and his sons to the door of the tabernacle of meeting and wash them with water. You shall put the holy garments on Aaron, and anoint him and consecrate him, that he may minister to Me as priest. And you shall bring his sons and clothe them with tunics. You shall anoint them, as you anointed their father, that they may minister to Me as priests; for their anointing shall surely be an everlasting priesthood throughout their generations.”