Numbers 3:11-13 And the LORD spoke to Moses, saying, “Behold, I have taken the Levites from among the people of Israel instead of every firstborn who opens the womb among the people of Israel. The Levites shall be mine, for all the firstborn are mine. On the day that I struck down all the firstborn in the land of Egypt, I consecrated for my own all the firstborn in Israel, both of man and of beast. They shall be mine: I am the LORD.”
Numbers 3:45 “Take the Levites instead of all the firstborn among the people of Israel, and the cattle of the Levites instead of their cattle. The Levites shall be mine: I am the LORD.
Numbers 3:45 “Take the Levites instead of all the firstborn among the people of Israel, and the cattle of the Levites instead of their cattle. The Levites shall be mine: I am the LORD.
Numbers 8:16 For they are wholly given to me from among the people of Israel. Instead of all who open the womb, the firstborn of all the people of Israel, I have taken them for myself.
Numbers 8:18 and I have taken the Levites instead of all the firstborn among the people of Israel.
Numbers 18:6 And behold, I have taken your brothers the Levites from among the people of Israel. They are a gift to you, given to the LORD, to do the service of the tent of meeting.
I have taken the Levites, &c.—The consecration of this tribe did not originate in the legislative wisdom of Moses, but in the special appointment of God, who chose them as substitutes for the first-born. By an appointment made in memory of the last solemn judgment on Egypt (from which the Israelitish households were miraculously exempt) all the first-born were consecrated to God (Ex 13:12; 22:29), who thus, under peculiar circumstances, seemed to adopt the patriarchal usage of appointing the oldest to act as the priest of the family. But the privilege of redemption that was allowed the first-born opened the way for a change; and accordingly, on the full organization of the Mosaic economy, the administration of sacred things formerly committed to the first-born was transferred from them to the Levites, who received that honor partly as a tribute to Moses and Aaron, partly because this tribe had distinguished themselves by their zeal in the affair of the golden calf (Ex 32:29), and also because, being the smallest of the tribes, they could ill find suitable employment and support in the work. (See on [55]De 33:8). The designation of a special class for the sacred offices of religion was a wise arrangement; for, on their settlement in Canaan, the people would be so occupied that they might not be at leisure to wait on the service of the sanctuary, and sacred things might, from various causes, fall into neglect. But the appointment of an entire tribe to the divine service ensured the regular performance of the rites of religion. The subsequent portion of the chapter relates to the formal substitution of this tribe.
I am the Lord—that is, I decree it to be so; and being possessed of sovereign authority, I expect full obedience. (Brown)
Moreover, the Levites had proved themselves to be the most suitable of all the tribes for his post, through their firm and faithful defence of the honour of the Lord at the worship of the golden calf (Exodus 32:26.). It is in this spirit, which distinguished the tribe of Levi, that we may undoubtedly discover the reason why they were chosen by God for the service of the sanctuary. (Keil)