Numbers 3:48

New American Bible - revised edition

Give this money to Aaron and his sons as a redemption-price for the extra number.

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you shall take five shekels for each individual, according to the sanctuary shekel, twenty gerahs to the shekel.

So Moses took the redemption money for those over and above the ones redeemed by the Levites.

He then gave this redemption money to Aaron and his sons, at the direction of the Lord, just as the Lord had commanded Moses.