2 Kings 3:2-6

He did evil in the sight of the Lord, though not like his father and his mother; for he removed the memorial stone of Baal which his father had made.

Nevertheless, he clung to the sins of Jeroboam the son of Nebat, into which he misled Israel; he did not abandon them.

Now Mesha the king of Moab was a sheep breeder, and he used to make tribute payments to the king of Israel of a hundred thousand lambs, and the wool of a hundred thousand rams.

However, when King Ahab died, the king of Moab broke with the king of Israel.

So King Jehoram left Samaria for battle at that time and mustered all Israel.