Numbers 3:48

New Living Translation

Give the silver to Aaron and his sons as the redemption price for the extra firstborn sons.”

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collect five pieces of silver for each of them (each piece weighing the same as the sanctuary shekel, which equals twenty gerahs).

So Moses collected the silver for redeeming the firstborn sons of Israel who exceeded the number of Levites.

And Moses gave the silver for the redemption to Aaron and his sons, just as the Lord had commanded.