Numbers 3:42-51 - The Levites Take The Place Of The First-Born Sons
42 So Moses mustered all the firstborn among the {Israelites} just as Yahweh commanded him. 43 And all [the] firstborn males among the number of names from {one month} and above, the {ones counted}, [were] twenty-two thousand two hundred and seventy-three.
44 Yahweh spoke to Moses, saying, 45 "Receive the Levites in the place of all [the] firstborn among the {Israelites}, and the animals of the Levites in the place of their animals; the Levites will be mine. I [am] Yahweh.
46 And the ransom of the two hundred and seventy-three of the firstborn of the {Israelites} who are excessive over the Levites, 47 you will receive five shekels a person, in the sanctuary shekel; you will collect twenty gerahs [per] shekel. 48 You will give the money to Aaron, and to his sons the ransom of the ones who are excessive among them."
49 And Moses received the money of the redemption from the ones who were excessive from those redeemed of the Levites. 50 From the firstborn of the {Israelites} he took the money, one thousand three hundred and sixty-five shekels, in the sanctuary shekel. 51 And Moses gave the money of the ransom to Aaron and to his sons according to the {word} of Yahweh just as Yahweh commanded Moses.