2 Chronicles 31:15-16

15And under him were Eden, and Miniamin, and Jeshua, and Shemaiah, Amariah, and Shecaniah, in the cities of the priests, in their set office, to give to their brethren by courses, as well to the great as to the small:

16beside them that were reckoned by genealogy of males, from three years old and upward, even every one that entered into the house of the LORD, as the duty of every day required, for their service in their charges according to their courses;