Leviticus 8:12-14

12Then he poured some of the 1anointing oil on Aaron’s head and anointed him, to consecrate him. 132Next Moses had Aaron’s sons come near and clothed them with tunics, and girded them with sashes and bound 3caps on them, just as the Lord had commanded Moses.

14Then he brought 4the bull of the sin offering, and Aaron and his sons laid their hands on the head of the bull of the sin offering.