Exodus 40:12-15

12Bring Aaron and his sons to the entrance of the Tent of Meeting. Wash them with water.

13Then dress Aaron in the special clothes for the priest. Pour some of the special oil on his head. Offer him to me to serve me as my priest.

14Also bring his sons and dress them in the special long shirts.

15Pour some oil on their heads, as you did to their father. Then they too may serve me as my priests. In this way, they and their descendants will always continue to serve me as priests.’