Leviticus 9:7

⁷And Moses said to Aaron, Nigh thou to the altar, and offer thou for thy sin; offer thou burnt sacrifice, and pray for thee, and for the people; and when thou hast slain the sacrifice of the people, pray thou for them, as the Lord commanded. (And Moses said to Aaron, Approach thou to the altar, and offer thy sin offering, and thy burnt sacrifice, and pray for thyself, and for the people; and when thou hast killed the offering for the people, pray thou for them, as the Lord commanded.)