Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[246] Now I cannot but think that the greatness of a kingdom, and its change into prosperity, often become the occasion of mischief and of transgression to men; for when Rehoboam saw that his kingdom was so much increased, he went out of the right way unto unrighteous and irreligious practices, and he despised the worship of God, till the people themselves imitated his wicked actions: for so it usually happens, that the manners of subjects are corrupted at the same time with those of their governors, which subjects then lay aside their own sober way of living, as a reproof of their governors' intemperate courses, and follow their wickedness as if it were virtue; for it is not possible to show that men approve of the actions of their kings, unless they do the same actions with them. Agreeable whereto it now happened to the subjects of Rehoboam; for when he was grown impious, and a transgressor himself, they endeavored not to offend him by resolving still to be righteous. But God sent Shishak, king of Egypt, to punish them for their unjust behavior towards him, concerning whom Herodotus was mistaken, and applied his actions to Sesostris; for this Shishak, ¹ in the fifth year of the reign of Rehoboam, made an expedition [into Judea] with many ten thousand men; for he had one thousand two hundred chariots in number that followed him, and threescore thousand horsemen, and four hundred thousand footmen. These he brought with him, and they were the greatest part of them Libyans and Ethiopians. Now therefore when he fell upon the country of the Hebrews, he took the strongest cities of Rehoboam's kingdom without fighting; and when he had put garrisons in them, he came last of all to Jerusalem.