And the Lord spake. It is well known that in conjunction with the sacrifices there was an offering, which they call minha, but we shall elsewhere see that this was also used separately; for it was lawful without a victim to offer either plain meal, or cakes, or wafers seasoned with oil. Therefore, besides the sacrifice of consecration, of which Moses has already treated, this second offering is required from the priest, that he should present at his inauguration a cake fried in a pan, and cut in pieces. The reason of this appears to have been, that he might thence become the legitimate minister of all the people, and might duly offer in the name of others, when he had done what was right for himself. But a distinction is drawn between the demand upon the priest and that, upon the people, viz., that it should be "wholly burnt;" the reason for which, since it will be explained elsewhere, it will be now sufficient to advert to in a single word. The fact was that God was unwilling that the priests should indulge themselves in vain ostentation, which might have been easily the case, if the oblation had been preserved for their use, like the minha of the people which remained in their hands.

And the Lord spake unto Moses,.... The following section or paragraph, relating to the consecration of Aaron and his sons, was delivered, according to Jarchi, seven days before the setting up of the tabernacle; but to me it seems to have been delivered after the setting it up, since it was out of the tabernacle that the Lord said all those things recorded in the preceding chapters; and after he had given out the laws concerning sacrifices, then he renewed the order for the consecration of Aaron and his sons, that they might offer them:
saying; as follows.

The consecration of Aaron and his sons had been delayed until the tabernacle had been prepared, and the laws of the sacrifices given. Aaron and his sons were washed with water, to signify that they ought to purify themselves from all sinful dispositions, and ever after to keep themselves pure. Christ washes those from their sins in his own blood whom he makes kings and priests to our God, Revelation 1:5, Revelation 1:6; and those that draw near to God must be washed in pure water, Hebrews 10:22. The anointing of Aaron was to typify the anointing of Christ with the Spirit, which was not given by measure to him. All believers have received the anointing.

Consecration of the Priests and the Sanctuary (cf. Ex 29:1-37). - The consecration of Aaron and his sons as priests was carried out by Moses according to the instructions in Ex 29:1-36; Exodus 40:12-15; and the anointing of the tabernacle, with the altar and its furniture, as prescribed in Exodus 29:37; Exodus 30:26-29, and Exodus 40:9-11, was connected with it (Leviticus 8:10, Leviticus 8:11).