Leviticus 9:5-7

⁵Therefore they took all things, which Moses commanded, to the door of the tabernacle, where, when all the multitude stood,

⁶Moses said, This is the word which the Lord commanded, do ye it, and his glory shall appear to you.

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.