Numbers 3:46-51

46And for the redemption of the two hundred and threescore and thirteen of the first-born of the children of Israel, that are over and above the number of the Levites, 47thou shalt take five shekels apiece by the poll; after the shekel of the sanctuary shalt thou take them (the shekel is twenty gerahs): 48and thou shalt give the money, wherewith the odd number of them is redeemed, unto Aaron and to his sons. 49And Moses took the redemption-money from them that were over and above them that were redeemed by the Levites; 50from the first-born of the children of Israel took he the money, a thousand three hundred and threescore and five shekels, after the shekel of the sanctuary: 51and Moses gave the redemption-money unto Aaron and to his sons, according to the word of Jehovah, as Jehovah commanded Moses.