Solomon had 4,000 stalls for horses and chariots, and 12,000 horses, which he stationed in the chariot cities and also with him in Jerusalem.
Jewish Publication Society of America Version (JPS1917) - 2 Chronicles 9:25 >And Solomon had four thousand stalls for horses and chariots, and twelve thousand horsemen, that he bestowed in the chariot cities, and with the king at Jerusalem.