Numbers 3:44

42Moses counted, as the LORD commanded him, all the firstborn among the children of Israel.

43All the firstborn males according to the number of names from a month old and upward, of those who were counted of them, were twenty-two thousand two hundred seventy-three.

44The LORD spoke to Moses, saying,

45“Take the Levites instead of all the firstborn among the children of Israel, and the livestock of the Levites instead of their livestock; and the Levites shall be mine. I am the LORD.

46For the redemption of the two hundred seventy-three of the firstborn of the children of Israel who exceed the number of the Levites,