Exodus 40:13

10 And put oil on the altar of burned offering, and make it and all its vessels holy; this altar is to be most holy.

11 And put oil on the washing-vessel and its base, and make them holy.

12 Then let Aaron and his sons come to the door of the Tent of meeting; and after washing them with water,

13 You are to put on Aaron the holy robes; and you are to put oil on him, and make him holy, so that he may be my priest.

14 And take his sons with him and put coats on them;

15 And put oil on them as you did on their father, so that they may be my priests: the putting on of oil will make them priests for ever, from generation to generation.

16 And Moses did this; as the Lord gave him orders, so he did.