Numbers 3:38-40

Young's Literal Translation

³⁸ And those encamping before the tabernacle eastward, before the tent of meeting, at the east, [are] Moses and Aaron, and his sons, keeping the charge of the sanctuary for the charge of the sons of Israel, and the stranger who cometh near is put to death.

³⁹ All those numbered of the Levites whom Moses numbered -- Aaron also -- by the command of Jehovah, by their families, every male from a son of a month and upward, [are] two and twenty thousand.

⁴⁰ And Jehovah saith unto Moses, `Number every first-born male of the sons of Israel from a son of a month and upward, and take up the number of their names;