Matthew Henry on Leviticus 9:1-7
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. The priests had not so much as one day's respite from service allowed them, that they might divert themselves, and receive the compliments of their friends upon their elevation, but were busily employed the very next day; for their consecration was the filling of their hands. God's spiritual priests have constant work cut out for the…
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And the glory of the Lord shall appear - God shall give the most sensible signs of his presence among you; this he did in general by the cloud on the tabernacle, but in this case the particular proof was the fire that came out from before the Lord, and consumed the burnt-offering; see Lev 9:23, Lev 9:24.
John Gill on Leviticus 9:6
This is the thing which the Lord commanded that ye should do,.... Namely, what they had done, bring the creatures and things for sacrifice they had:
and the glory of the Lord shall appear unto you; either Christ, the brightness of his Father's glory, in an human form, as a presage of his future incarnation, as he frequently did; or some more than ordinary refulgence of glory breaking out of the holy of holies, where God had now taken up his dwelling between the cherubim; or, as Aben Ezra explains it, the fire that should go out from him, and consume the sacrifice, which would be a demonstration of his presence with them, and of his acceptance of the sacrifice.
John Calvin on Leviticus 9:6
And Moses said, This is the thing which the Lord commanded He seems, indeed, to address himself to the whole people, to whom also the promise belonged; but in the word "do ye," [413] He specially speaks to the sons of Aaron; and he promises what, at the end of the chapter, he will state to have been fulfilled, that the glory of God should be manifested in approbation of the priesthood, in order that they may set about their duties more cheerfully. For this was no common aid to their faith and assurance, that their office should be thus, as it were, sealed by God.