Observe, when the service of the sanctuary, according to GOD'S commandment of it, was completed, Moses and Aaron went in (most probably) to follow up the service with prayer. Here again they represented the LORD JESUS, when in his final prayer he said, I have finished the work thou gavest me to do, and now, O FATHER, glorify me. John 17:4-5.
Related Commentaries of Leviticus 9:23
Leviticus 9:23
23 And Moses and Aaron went into the tabernacle of the congregation, and came out, and blessed the people: and the glory of the LORD appeared unto all the people.