2 Chronicles 31:16-17

¹⁶besides those who were reckoned by genealogy of males, from three years old and upward, even everyone who entered into the house of Yahweh, as the duty of every day required, for their service in their offices according to their courses; ¹⁷and those who were reckoned by genealogy of the priests by their fathers` houses, and the Levites from twenty years old and upward, in their offices by their courses;