And the days that Solomon reigned in Jerusalem over all Israel, were forty years.

And the time Solomon was king in Jerusalem over all Israel was forty years.

Josephus gave Solomon a reign of 80 years, either because he wished to increase the glory of his country's greatest king, or through his having a false reading in his copy of the Septuagint Version. It is, no doubt, remarkable that the three successive kings, Saul, David, and Solomon, should have each reigned forty years Acts 13:21; 2-Samuel 5:4-5; but such numerical coincidences occur from time to time in exact history.

Solomon reigned - forty years - Josephus says fourscore years, which is sufficiently absurd. Calmet supposes him to have been eighteen years old when he came to the throne, and that he died A.M. 3029, aged fifty-eight years; and, when we consider the excess in which he lived, and the criminal passions which he must have indulged among his thousand wives, and their idolatrous and impure worship, this life was as long as could be reasonably expected.

And the time that Solomon reigned in Jerusalem, over all Israel, was forty years. The same says Eupolemus (z), an Heathen writer, who makes him to live but fifty two years; which is the common tradition of the Jews, who suppose he was but twelve years of age when he began to reign; which is to be confuted from the age of his son Rehoboam, see 1-Kings 14:21. Josephus (a), on the other hand, makes him to live to too great an age, who says that he reigned eighty years, and lived to ninety four.
(z) Apud Euseb. Praepar. Evangel. l. 9. c. 34. (a) Antiqu. l. 8. c. 7. sect. 8.

Forty years - His reign was as long as his father's, but not his life; sin shortened his days.