1 Kings 14:25

Fifth year — Presently after his and his people's apostacy, which was not 'till his fourth year: while apostate, Israel enjoyed peace and some kind of prosperity, of which difference, two reasons may be given: first, Judah'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, God discovered more love to Judah in chastizing them speedily, that they might be humbled, reformed, and preserved, as it happened; and more anger against Israel, whom he spared to that total destruction which he intended to bring upon them. Sishak — He is thought 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. Came up — Either, from a desire to enlarge his empire: or, by Jeroboam's instigation: or from a covetous desire of possessing those great treasures which David and Solomon had left: and above all, by God's providence, disposing his heart to this expedition for Rehoboam's punishment.