1 Kings 15:6-7

6In Abijah's whole life, there was a war between the armies of Rehoboam and Jeroboam.

7The other things that happened while Abijah was king are written in a book. The book is called ‘The history of Judah's kings’. It tells about all the things that Abijah did. While Abijah was king, there was war between his army and Jeroboam's army.