And Moses said to the congregation, “This is the thing that the LORD has commanded to be done.”
God had given Moses orders to consecrate Aaron and his sons to the priests' office, when he was with him the first time upon mount Sinai, Ex. 28 and Exo 29:1, where we have also the particular instructions he had how to do it. Now here we have, I. The orders repeated. What was there commanded to be done is here commanded to be done now, Lev 8:2, Lev 8:3.
Commenting on Leviticus 8:1-13
And Moses said unto the congregation,.... Having convened them, he opened to them the reason of their being called together, which was not done of himself, but by divine direction: this is the thing which the Lord commanded to be done; namely, what follows, concerning the consecration of Aaron and his sons to be priests, and the investiture of them with that office, attended with...
Lev 8:5 When the congregation was assembled, Moses said, “This is the word which Jehovah commanded you to do.” His meaning was, the substance or essential part of the instructions in Exo 28:1 and 29:1-37, which he had published to the assembled congregation before the commencement of the act of consecration, and which are not repeated here as being already known from those chapters.