Both to the genealogy of the priests by the house of their fathers, and the Levites from twenty years old and upward, in their charges by their courses; From twenty years old - Moses had ordered that the Levites should not begin their labor till they were thirty years of age; but David changed this order, and obliged them to begin at twenty.
Related Commentaries of 2 Chronicles 31:17
2 Chronicles 31:17
17 Both to the genealogy of the priests by the house of their fathers, and the Levites from twenty years old and upward, in their charges by their courses;