John Calvin on Leviticus 9:23-24

23. And Moses and Aaron went into the tabernacle This is a repetition of the same statement, except that what had been said of Aaron only is now also ascribed to Moses, i.e., that he blessed the people, but for a different reason, for although he was God’s prophet, yet Aaron, in right of his office, was the only mediator. What follows, “the glory of the Lord appeared,” may be read separately, viz., that the majesty of God was manifested in some conspicuous sign; or else it is connected with the concluding verse, where it is said, that “there came a fire out from before the Lord, etc.” If we prefer the latter, the account of the consuming of the sacrifice was added expositively, as if it were said that God appeared when He sent forth the fire to consume the sacrifice. By this auspice, or rather miracle, God manifested that He was the Author of the legal priesthood, so that it should be held in reverence for ever. The same thing sometimes occurred afterwards, when in troubled circumstances, it had need of extraordinary confirmation: thus fire consumed the sacrifice of Manoah, (Judges 13:20;) or, when God’s service and pure religion required to be vindicated in opposition to superstitious counterfeits; thus the sacrifice of Elijah was utterly consumed and reduced to ashes without the application of fire. (1 Kings 18:38.) Or, lastly, when God would shew that He delighted in Mount Sion, which He had chosen for His resting-place and home: for which reason, the first sacrifice of Solomon was consumed by fire from heaven. (2 Chronicles 7:1.)

Lest posterity should doubt of this matter, as if it were not thoroughly certain, Moses says that the whole people was stirred up by the sight to praise God, “and fell on their faces.”

Numbers 8

Numbers 8:20-22

20. And Moses, and Aaron, and all the congregation of the children of Israel, did to the Levites according unto all that the Lord commanded Moses concerning the Levites, so did the children of Israel unto them.

20. Fecit itaque Moses et Aharon, et omnis congregatio filiorum Israel, de Levitis: secundum crania quae praeceperat Jehova Mosi de Levitis, sic feterunt illis filii Israel

21. And the Levites were purified, and they washed their clothes; and Aaron offered them as an offering before the Lord; and Aaron made an atonement for them to cleanse them.

21. Et purificaverunt sese Levitae, laveruntque vestimenta sua et obtulit Aharon filius oblationem coram Jehova, et expiavit eos Aharon, ut purificaret eos.

22. And after that went the Levites in to do their service in the tabernacle of the congregation before Aaron, and before his sons: as the Lord had commanded Moses concerning the Levites, so did they unto them.

22. His peractis aggressi sunt Levitae fungi ministerio suo in tabernaculo conventionis coram Abaton, et coram filiis ejus: quemadmodum praeceperat Jehova Mosi de Levitis, sic fecerunt illis.