Numbers 3:39-41

New Catholic Bible

³⁹ The total number of the Levites who were counted by Moses and Aaron at the command of the Lord, everyone in their families who was one month old and older, was twenty-two thousand.

⁴⁰ Redemption of the Firstborn. The Lord said to Moses, “Count all the firstborn males of the people of Israel, those one month old and older, and make a list of their names. ⁴¹ The Levites will be a substitute for me in place of the firstborn of the people of Israel. I am the Lord. The cattle of the Levites will be a substitute for the firstborn of the cattle of the people of Israel.”