John Gill Commentary Exodus 28:41

"And thou shalt put them upon Aaron thy brother, and upon his sons with him, and shalt anoint them, and consecrate them, and sanctify them, that they may minister unto me in the priest`s office." — Exodus 28:41 (ASV)

And you shall put them on Aaron your brother, and his sons
with him
And this putting on of their garments by Moses, under the authority of God, was a solemn investiture of them with the priestly office also; for from henceforward they had a right to exercise it, having those garments on, without which they were never to officiate:

and shall anoint them ;
with the anointing oil, of which afterwards a particular account is given, and how to be made, and for what use, (Exodus 30:22–30) , typical of the holy graces of the Spirit of God:

and consecrate them ;
the consecration of them was by investing them with their garments, and by anointing them with oil; for this phrase does not intend the whole of their consecration, only another branch of it, and may be literally rendered, "fill their hand" ^F16 ; that is, with sacrifices to be offered up by them, see (Exodus 29:1Exodus 29:24) (2 Chronicles 13:9)

and sanctify them ;
by all this, set them apart, and devote them to the sacred office of priesthood:

that they may minister unto me in the priest's office ;
by offering sacrifices for the people, burning incense, and doing other things relative to the office.

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FOOTNOTES:

• F16: (Mdy ta talmw) "et implebis manum eorum", Montanus, Vatablus, Tigurine version, Fagius, Piscator.