Numbers 3:45-51

MLV(i) 45 Take the Levites instead of all the firstborn among the sons of Israel and the cattle of the Levites instead of their cattle. And the Levites will be mine. I am Jehovah. 46 And for the redemption of the two hundred and seventy-three of the firstborn of the sons of Israel, who are over and above the number of the Levites, 47 you will take five shekels apiece by the poll. According to the shekel of the sanctuary you will take them (the shekel is twenty gerahs), 48 and you will give the money, with which the odd number of them is redeemed, to Aaron and to his sons.
49 And Moses took the redemption-money from those who were over and above those who were redeemed by the Levites. 50 He took the money from the firstborn of the sons of Israel, a thousand three hundred and sixty-five shekels, according to the shekel of the sanctuary. 51 And Moses gave the redemption-money to Aaron and to his sons, according to the word of Jehovah, as Jehovah commanded Moses.