2 Chronicles 12:1 - Joseph Benson’s Commentary on the Old and New Testaments

When Rehoboam had established the kingdom Israel was very much disgraced and weakened by being divided into two kingdoms; yet the kingdom of Judah, having both the temple and the royal city, both the house of David and the house of Aaron, might have done very well if they had continued in the way of their duty: but here we have all out of order there. For Rehoboam forsook the law of the Lord, and all Israel with him That is, all his people, all Judah, here called Israel, because they walked in the evil ways into which Jeroboam had drawn the kingdom of Israel. Of this defection from God and his service, see 1 Kings 14:22-24. Observe, reader; as long as he thought his throne in an insecure state, he kept to his duty, that he might make God his friend; but when he judged that he was established in his kingdom, he acted as if he thought he had no more occasion for religion. Thus the prosperity of fools destroys them.