Matthew Poole and continuators on 1 Kings 14:25

25 ¶ And it came to pass in the fifth year of king Rehoboam , that Shishak king of Egypt came up against Jerusalem .

Presently after his and his Peoples Apostacy, which was not till his fourth year: when the Apostatical Israelites enjoyed Peace and some kind of Prosperity, at first, for many Years together: of which difference two reasons may be given: First, That Iudah's sins were committed against clearer Light, and more powerful means and remedies of all sorts, and therefore deserved more severe and speedy Judgments. Secondly, That God discovered more Love to Iudah in chastizing them speedily, that so they might be humbled, and reformed, and so graciously preserved, as it happened; and more anger against Israel, that he spared them, and by their impunity hardned and ripened them to that total destruction which he intended to bring upon them.

Of whom see 1 King. 11. 40. and 2 Chron. 12. 2, &c. where this History is more fully described. He is thought by many to be Solomon's Brother-in-law. But how little such Relations signify among Princes, when their Interest is concerned, all Histories witness. Besides Rehoboam was not Solomon's Son by Pharaoh's Daughter, and so the relation was in a manner extinct.

Either, From ambition and a desire to enlarge his Empire: or, from jealousie of Rehoboam's growing-greatness: Of which see 2 Chron. 11. or, by Ieroboam's instigation: or, from a covetous desire of possessing these great treasures which David and Solomon had left: and, above all, by Gods Providence, disposing his heart to this expedition for Rehoboam's punishment.