Numbers 3:43-46

⁴³And all the first-born males, according to the number of names, from a month old and upward as numbered were twenty-two thousand two hundred and seventy-three.

⁴⁴And the LORD said to Moses, ⁴⁵"Take the Levites instead of all the first-born among the people of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the LORD. ⁴⁶And for the redemption of the two hundred and seventy-three of the first-born of the people of Israel, over and above the number of the male Levites,