Midrasz do Diwrej ha-jamim II 9:25

R. Juda propounded the following contradiction (I Kings 5, G) And Solomon had forty thousand stalls for the horses for his chariots, and twelve thousand horsemen; and again (II Chron. 9, 25) And Solomon had four thousand stalls for horses and chariots. How is this to be taken? — i.e., if there were forty thousand stables, every one of them contained four thousand stalls; and if there were only four thousand stables, then each contained forty thousand stalls. R. Isaac propounded the following contradiction: It is written (I Kings 10, 21) None were of silver; it was not in the least valued in the days of Solomon; and again (Ib. 27) And Solomon rendered the silver in Jerusalem like stones. [Hence it did have some value]? This presents no difficulty. The first verse refers to Solomon before he married the daughter of Pharaoh, and the second after that time." R. Isaac said: "When Solomon married the daughter of Pharaoh, Gabriel came down and stuck a reed into the sea, and it gathered about it a bank on which the great city of Rome was built."