2 Chronicles 9:25
And Solomon had four thousand stalls for horses and chariots, and twelve thousand horsemen; whom he bestowed in the chariot cities, and with the king at Jerusalem. And Solomon had four thousand stalls for horses and chariots, and twelve thousand horsemen; whom he bestowed in the chariot cities, and with the king at Jerusalem.
2 Chronicles 1–9 gives the history of Solomon's reign over the undivided kingdom in chronological order, and this verse belongs to that account. Within that history, details of Solomon's reign such as this are told briefly, while the temple and its services are described at much greater length. The verse stands as part of the record of Solomon's vast riches and the luxury and magnificence of his court.
It records his large force of horses and horsemen, stationed in the chariot cities and with the king at Jerusalem. That accumulation violated the command that the king should not multiply horses to himself. The restriction was meant to discourage reliance on military power. It was also meant to guard against Egyptian idolatry and the sun-worship associated with horses. Solomon's disobedience in this matter helped introduce sun-worship into the temple, which Josiah later removed.