2 Kings 14:17
"And Amaziah the son of Joash king of Judah lived after the death of Jehoash son of Jehoahaz king of Israel fifteen years."
Cross References (ranked by relevance)
2 Kings 13:10
In the thirty and seventh year of Joash king of Judah began Jehoash the son of Jehoahaz to reign over Israel in Samaria, and reigned sixteen years.
2 Kings 14:23
In the fifteenth year of Amaziah the son of Joash king of Judah Jeroboam the son of Joash king of Israel began to reign in Samaria, and reigned forty and one years.