1 Kings 15:28-32

So Baasha killed him in the third year of Asa king of Judah, and reigned in his place.

And as soon as he was king, he struck and killed all the household of Jeroboam. He did not leave Jeroboam any persons alive, but kept killing until he had eliminated them, in accordance with the word of the Lord which He spoke by His servant Ahijah the Shilonite,

and because of the sins of Jeroboam which he committed, and into which he misled Israel, because of his provocation with which he provoked the Lord God of Israel to anger.

Now as for the rest of the acts of Nadab and all that he did, are they not written in the Book of the Chronicles of the Kings of Israel? War with Judah

And there was war between Asa and Baasha king of Israel all their days.