In the second year of the reign of King Asa of Judah, King Jeroboam's son Nadab became king of Israel, and he ruled for two years.
Like his father before him, he sinned against the Lord and led Israel into sin.
Baasha son of Ahijah, of the tribe of Issachar, plotted against Nadab and killed him as Nadab and his army were besieging the city of Gibbethon in Philistia.
This happened during the third year of the reign of King Asa of Judah. And so Baasha succeeded Nadab as king of Israel.
At once he began killing all the members of Jeroboam's family. In accordance with what the Lord had said through his servant, the prophet Ahijah from Shiloh, all of Jeroboam's family were killed; not one survived. 1
References for 1 Kings 15:29
15.29 1 K 14.10.
This happened because Jeroboam aroused the anger of the Lord, the God of Israel, by the sins that he committed and that he caused Israel to commit.
Everything else that Nadab did is recorded in [The History of the Kings of Israel.]
King Asa of Judah and King Baasha of Israel were constantly at war with each other as long as they were in power.