Leviticus 27:26-27 - Redemption Of The Firstborn
26 But the first-born which shall be first to Jehovah among the cattle, a man shall not consecrate it; if an ox, if a sheep, it is to Jehovah. 27 And if from unclean cattle, and he redeemed by thy estimation, and he shall add the fifth upon it: and if it shall not be redeemed, and it was sold by thy estimation.
40 And Jehovah will say to Moses, Review every first-born male to the sons of Israel, from the son of a month and above, and take up the number of names. 41 And take the Levites for me (I Jehovah) instead of all the first-born of the sons of Israel; and the cattle of the Levites instead of all the first-born among the cattle of the sons of Israel. 42 And Moses reviewed as Jehovah commanded him, all the first-born of the sons of Israel. 43 And every first-born male shall be according to the number of names, from the son of a month and above, for those being reviewed, two and twenty thousand three and seventy and two hundred.
44 And Jehovah will speak to Moses, saying, 45 Take the Levites instead of all the first-born of the sons of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be to me: I Jehovah.
46 And the price of redemption of the three and seventy and two hundred, of those remaining over the Levites, from the first-born of the sons of Israel: 47 And thou shalt take five shekels by the heads, according to the holy shekel thou shalt take: twenty gerahs the shekel. 48 And give the silver to Aaron and to his sons, the price of redemption of those remaining over among them.
49 And Moses will take the silver of the price of their redemption, from those remaining over them redeemed of the Levites. 50 From the first-born of the sons of Israel he took the silver; five and sixty and three hundred and a thousand, according to the holy shekel. 51 And Moses will give the silver of those being redeemed, to Aaron and to his sons, at the mouth of Jehovah, as Jehovah commanded Moses.