Numbers 3:42

39 All the Levites numbered by Moses and Aaron at the order of the Lord, all the males of one month old and over numbered in the order of their families, were twenty-two thousand.

40 And the Lord said to Moses, Let all the first male children be numbered, and take the number of their names.

41 And give to me the Levites (I am the Lord) in place of the first sons of the children of Israel; and the cattle of the Levites in place of the first births among the cattle of the children of Israel.

42 So Moses had all the first sons among the children of Israel numbered, as the Lord said to him.

43 Every first son from a month old and over was numbered by name, and the number came to twenty-two thousand, two hundred and seventy-three.

44 And the Lord said to Moses,

45 Take the Levites in place of all the first sons of the children of Israel, and the cattle of the Levites in place of their cattle; the Levites are to be mine; I am the Lord.