30 There was continual warfare between Rehoboam and Jeroboam,
1 Kings 14:30 Cross References - ISV
1 Kings 12:21
21 As soon as Rehoboam returned to Jerusalem, he assembled 180,000 elite soldiers from the tribes of Judah and Benjamin, intending to attack the dynasty of Israel and restore the kingdom to Solomon’s son Rehoboam.
1 Kings 12:24
24 ‘This is what the LORD says: “You are not to fight or even approach your fellow Israelis in battle. Every soldier is to return to his own home, because this development comes from me.”’” So they listened to what the LORD had to say and returned home, just as the LORD had directed.
1 Kings 15:6-7
6 There was continual military conflict between Rehoboam and Jeroboam throughout his entire lifetime.
7 The rest of Abijah’s accomplishments, including everything he undertook, are written in the Chronicles of the Kings of Judah, are they not? And a state of war continued to exist between Abijah and Jeroboam.
2 Chronicles 12:15
15 Now Rehoboam’s accomplishments, from first to last, are written in the records of Shemaiah the prophet and of Iddo the seer, enrolled by genealogy, are they not?