Leviticus 8:12-14

12Then he poured some of the anointing oil on Aaron’s head, anointing him and making him holy for his work.

13Next Moses presented Aaron’s sons. He clothed them in their tunics, tied their sashes around them, and put their special head coverings on them, just as the Lord had commanded him.

14Then Moses presented the bull for the sin offering. Aaron and his sons laid their hands on the bull’s head,