Charles Ellicott Commentary Leviticus 8:4

"And Moses did as Jehovah commanded him; and the congregation was assembled at the door of the tent of meeting." — Leviticus 8:4 (ASV)

And Moses did as the Lord commanded him. —That is, he not only summoned Aaron and his sons, but had their holy vestments, the oil, and the sacrifices brought, which were necessary for the consecration.

Unto the door of the tabernacle of the congregation. —Better, to the entrance of the tent of meeting. These representatives of the people, and as many more as the place would conveniently hold, occupied the courtyard, while the people at large who wished to witness the solemn consecration of the priesthood probably occupied the neighbouring places which overlooked the enclosure. According to a tradition which was prevalent in the time of Christ, this ceremony took place on the 23rd of the month Adar, or February.