Charles Ellicott Commentary 1 Chronicles 27:2

"Over the first course for the first month was Jashobeam the son of Zabdiel: and in his course were twenty and four thousand." — 1 Chronicles 27:2 (ASV)

Over the first course. —Jashobeam son of Zabdiel was commander of the army corps appointed to be ready for service during the first month of the year. (See 1 Chronicles 11:11.) The names of the twelve generals of division have already occurred in the list of David’s heroes contained in that chapter.

In his course. —Hebrew, upon his course.