The rest of the events in Jehoash’s reign and everything he did, including the extent of his power and his war with King Amaziah of Judah, are recorded in The Book of the History of the Kings of Israel.
But Amaziah refused to listen, so King Jehoash of Israel mobilized his army against King Amaziah of Judah. The two armies drew up their battle lines at Beth-shemesh in Judah.
When King Amaziah returned from slaughtering the Edomites, he brought with him idols taken from the people of Seir. He set them up as his own gods, bowed down in front of them, and offered sacrifices to them!