Numbers 8:10

“And thou shalt bring the Levites before the Lord, etc.] From the door of the tabernacle, to the altar of burnt offering, where the Lord was in some sense present to accept the sacrifices offered to him: and the children of Israel shall put their hands upon the Levites; as were used to be put upon sacrifices, for the Levites were themselves offered for an offering of the children of Israel, as is expressed in (<040811>Numbers 8:11); by which rite they signified that they voluntarily parted with them, and gave them up to the Lord, and transferred their service to them, in which they were to serve in their room and stead; these, according to some Jewish writers, were the firstborn of Israel…”

“The Levites could only undertake their duties Numbers 3:0; Numbers 4:0 after the formal exchange of the Levites for the first-born Numbers 3:44-51. The distinction between the “consecration” of the priests Leviticus 8:0 and the less solemn “purification” Numbers 8:21 of the Levites is marked. These rites of purification are similar to those incumbent on the priests of Egypt. Numbers 8:7 Water of purifying - literally, “sin water:” i. e. water to cleanse from sin; no doubt taken from the laver of the sanctuary, which was used by the priests for purification before they went into the tabernacle to minister (compare Numbers 5:17; Exodus 30:18 ff). The “sprinkling” of so large a body of men…”

“The children of Israel - Not all of them, which was impossible, but some in the name of all the princes or chiefs of each tribe, who used to transact things in the name of their tribes. Put their hands - Whereby they signified their transferring that right of ministering to God from the first - born in whose hands it formerly was, to the Levites, and their entire resignation and dedication of them to God's service. Numbers 8:11”

“8:10-11 By the laying on of hands, Israel recognized the Levites’ special status and offered them as their representatives before the Lord (8:16).”

“Num 3:45; Lev 1:4; Act 6:6, Act 13:2, Act 13:3; Ti1 4:14, Ti1 5:22 Numbers 8:11”

“After this the Levites were to come before Jehovah, i.e., in front of the altar; and the children of Israel, i.e., the tribe-princes in the name of the Israelites, were to lay their hands upon them, not merely "as a sign that they released them from the possession of the nation, and assigned them and handed them over to Jehovah" (Knobel), but in order that by this symbolical act they might transfer to the Levites the obligation resting upon the whole nation to serve the Lord in the persons of its first-born sons, and might present them to the Lord as representatives of the first-born of Israel, to serve Him as living sacrifices. Numbers 8:11”