Moses
Leviticus 9:5ESV·traditional attribution

And they brought what Moses commanded in front of the tent of meeting, and all the congregation drew near and stood before the LORD.

Matthew Henry Presbyterian @wholebiblehenry

Orders are here given for another solemnity upon the eighth day; for the newly-ordained priests were set to work immediately after the days of their consecration were finished, to let them know that they were not ordained to be idle: He that desires the office of a bishop desires a good work, which must be looked at with desire, more than the honour and benefit.

Commenting on Leviticus 9:1-7

John Gill Reformed Baptist @doctorgill

And they brought that which Moses commanded before the tabernacle of the congregation,.... That is, Aaron and his sons, and all the children of Israel, as the Targum of Jonathan paraphrases it. All the above sacrifices they brought into the court of the tabernacle to be offered up: and all the congregation drew near, and stood before the Lord; that is, the elders of Israel...

Geneva Bible Notes Reformed @genevanotes

And they brought [that] which Moses commanded before the tabernacle of the congregation: and all the congregation drew near and stood before the LORD. (c) Before the altar where his glory appeared.