Numbers 3:47-51

Thou shalt even take five shekels apiece by the poll, after the shekel of the sanctuary shalt thou take them: (the shekel is twenty gerahs:)

And thou shalt give the money, wherewith the odd number of them is to be redeemed, unto Aaron and to his sons.

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

Of the firstborn of the children of Israel took he the money; a thousand three hundred and threescore and five shekels, after the shekel of the sanctuary:

And Moses gave the money of them that were redeemed unto Aaron and to his sons, according to the word of the LORD, as the LORD commanded Moses.