Numbers 3:40-51

40And Yhwh said unto Moses, Number all the firstborn of the males of the children of Israel from a month old and upward, and take the number of their names. 41And thou shalt take the Levites for me (I am Yhwh) instead of all the firstborn among the children of Israel; and the cattle of the Levites instead of all the firstlings among the cattle of the children of Israel. 42And Moses numbered, as Yhwh commanded him, all the firstborn among the children of Israel. 43And all the firstborn males by the number of names, from a month old and upward, of those that were numbered of them, were twenty and two thousand two hundred and threescore and thirteen.

44And Yhwh spake unto Moses, saying, 45Take the Levites instead of all the firstborn among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am Yhwh. 46And for those that are to be redeemed of the two hundred and threescore and thirteen of the firstborn of the children of Israel, which are more than the Levites; 47Thou shalt even 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 to be redeemed, unto Aaron and to his sons. 49And Moses took the redemption money of them that were over and above them that were redeemed by the Levites: 50Of 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: 51And Moses gave the money of them that were redeemed unto Aaron and to his sons, according to the word of Yhwh, as Yhwh commanded Moses.