'Written' in the Bible

All Israel was registered in the genealogies that are written in the Book of the Kings of Israel. But Judah was exiled to Babylon because of their unfaithfulness.

to offer burnt offerings regularly, morning and evening, to the Lord on the altar of burnt offerings and to do everything that was written in the law of the Lord, which He had commanded Israel to keep.

As for the events of King David’s reign, from beginning to end, note that they are written in the Events of Samuel the Seer, the Events of Nathan the Prophet, and the Events of Gad the Seer,