Shishak Attacks Jerusalem

1 After Rehoboam’s position as king was established and he had become strong, he and all Israela with him abandoned the law of the LORD.

Read 2 Chronicles 12:1 Using Other Translations

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.
When the rule of Rehoboam was established and he was strong, he abandoned the law of the LORD, and all Israel with him.
But when Rehoboam was firmly established and strong, he abandoned the Law of the LORD, and all Israel followed him in this sin.