Four thousand stalls, to wit, greater stalls, in each of which were ten stalls, in all forty thousand stalls, as it is in 1 Kings 4:26, See Poole on "1 Kings 4:26".
Related Commentaries of 2 Chronicles 9:25
2 Chronicles 9:25
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.