As usual the inspired writer concludes his narrative of the reign of Nadab by directing his readers to another source of information for that reign. In this case it is the Book of the Chronicles of the Kings of Israel.
This is a source that is no longer available to us; we do not know these chronicles.
31 Le reste des actions de Nadab, et tout ce qu'il a fait, cela n'est-il pas écrit dans le livre des Chroniques des rois d'Israël?