And Moses took the redemption money,.... Of five shekels per head:

of them that were over and above redeemed by the Levites; or were more than those redeemed by them. A Levite redeemed a firstborn, or freed him from the redemption price, being taken in lieu of him: 22,000 Levites were answerable to 22,000 firstborn of Israel; but as there were no more Levites than the above number, there remained two hundred seventy three firstborn to be redeemed by money, and it was the redemption money of these Moses took.

"The redeemed of the Levites" are the 22,000 who were redeemed by means of the Levites. In Numbers 3:50, the Chethibh הפּדים is the correct reading, and the Keri הפּדים an unnecessary emendation. The number of the first-born and that of the Levites has already been noticed in the introduction to Numbers 1.

And Moses took the redemption money of them that were over and above them that were redeemed by the Levites:

3:40-51 The number of the first-born, and that of the Levites, came near to each other. Known unto God are all his works beforehand; there is an exact proportion between them, and so it will appear, when they are compared together. The small number of first-born, over and above the number of the Levites, were to be redeemed, and the redemption-money given to Aaron. The church is called the church of the first-born, which is redeemed, not as they were, with silver and gold; but, being devoted by sin to the justice of God, is ransomed with the precious blood of the Son of God. All men are the Lord's by creation, and all true christians are his by redemption. Each should know his own post and duty; nor can any service required by such a Master be rightly accounted mean or hard.