1 Chronicles 27:10
The seventh captain for the seventh month was Helez the Pelonite, of the children of Ephraim: and in his course were twenty and four thousand. The seventh captain for the seventh month was Helez the Pelonite, of the children of Ephraim: and in his course were twenty and four thousand.
The surrounding list lays out the year as twelve monthly courses of duty in the regular army. The seventh captain's course fell in the seventh month and numbered twenty and four thousand men. That twelvefold monthly order is evidence that the prophetic year is made up of twelve months of thirty days each.
These monthly divisions partly explain the difference between the army totals in 1 Chronicles 21 and 2 Samuel 24, for the Chronicler's count included the regular army while the writer of Samuel left it out.