And it came to pass, when Rehoboam had established the kingdom, and had strengthened himself, his encouragement of the right worship of Jehovah bringing him many people from the northern kingdom, 2 Chronicles 11:16-17, and causing his undertakings to be attended by the blessings of God, he forsook the Law of the Lord, and all Israel with him, luxury, security, and ease led to religious decline, an experience which is not unusual, and the people in his own kingdom very readily followed him in his apostasy, thereby causing the designation "Israelites" to be applied to them, to their shame and disgrace.
Related Commentaries of 2 Chronicles 12:1
2 Chronicles 12:1
1 And it came to pass, when Rehoboam had established the kingdom, and had strengthened himself, he forsook the law of the LORD, and all Israel with him.