Numbers 3:39-41

Darby Translation

³⁹ All that were numbered of the Levites, whom Moses and Aaron numbered at the commandment of Jehovah, according to their families, all the males from a month old and upward, were twenty-two thousand.

⁴⁰ And Jehovah said to Moses, Number all the first-born males of the children of Israel from a month old and upward, and take the number of their names.

⁴¹ And thou shalt take the Levites for me (I am Jehovah) instead of all the firstborn among the children of Israel; and the cattle of the Levites, instead of all the firstlings among the cattle of the children of Israel.