1 Kings 11:42

And the time [Heb. days ] that Solomon reigned in Jerusalem over all Israel was forty years. [Josephus, here as elsewhere, doubles the figure, making his reign to have lasted eighty years. It is somewhat remarkable, but affords no just ground for suspicion, that each of the first three kings of Israel should have reigned just forty years. "Such numerical coincidences occur in exact history. Saosduchinus, Chiniladanus, and Nabopolassar, three consecutive kings of Babylon, reigned each twenty-one years" (Rawlinson).]