Question: Why is this so important?
God's answer:
God then led me to Notes on the Bible, by Albert Barnes, [1834], at sacred- texts.com on Leviticus 43. Below are the passages on the filling of the hands.
"Lev 8:22: The ram of consecration - The sacrifice of this ram was by far the most unique part of the whole ceremony. The words may be literally rendered "the ram of the fillings", and the name has been supposed to have reference to the ceremony in which Moses filled the hands of the priests; see Lev 8:27. The offering was in the highest sense "the sacrifice of completion or fulfilling", as being the central point of the consecrating rite. The final perfection of the creature is consecration to the Lord.
Lev 8:22: In the rite of filling the hands of the priests, Moses took the portions of the victim which usually belonged to the altar, with the right shoulder (or leg); he placed upon them one cake of each of the three kinds of unleavened bread contained in the basket (see Lev 8:2 note), and then put the whole first upon the hands of Aaron and in succession upon the hands of his sons: in each case, according to Jewish tradition, he put his own hands under the hands of the priest, moving them backwards and forwards, so as to wave the mass to and fro.
In this remarkable ceremony the gifts of the people appear to have been made over to the priests, as if in trust, for the service of the altar. The articles were presented to Yahweh and solemnly waved in the hands of the priests, but not by their own act and deed. The mediator of the Law, who was expressly commissioned on this occasion, was the agent in the process."
Then, God concludes by saying:
Vested here means. “Dressed or clothed, especially in ecclesiastical vestments.”44