Charles Ellicott Commentary 2 Samuel 15:23

"And all the country wept with a loud voice, and all the people passed over: the king also himself passed over the brook Kidron, and all the people passed over, toward the way of the wilderness." — 2 Samuel 15:23 (ASV)

The brook Kidron. —A valley with a watercourse, filled in winter, lying immediately east of Jerusalem, between the city and the Mount of Olives.