Numbers 3:42

All who were counted of the Levites, whom Moses and Aaron counted at the commandment of the LORD, by their families, all the males from a month old and upward, were twenty-two thousand.

The LORD said to Moses, “Count all the firstborn males of the children of Israel from a month old and upward, and take the number of their names.

You shall take the Levites for me—I am the LORD—instead of all the firstborn among the children of Israel; and the livestock of the Levites instead of all the firstborn among the livestock of the children of Israel.”

All 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.

The LORD spoke to Moses, saying,

“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.