2 Kings 13:12
And the rest of the acts of Joash, and all that he did, and his might wherewith he fought against Amaziah king of Judah, are they not written in the book of the chronicles of the kings of Israel? And the rest of the acts of Joash, and all that he did, and his might wherewith he fought against Amaziah king of Judah, are they not written in the book of the chronicles of the kings of Israel?
The verse belongs to the record of the kings of Israel during the reign of Jehoash over the ten tribes. Jehoash reigned sixteen years in a period marked by war and strife. Its setting falls at the time of Elisha's final sickness and death, about 796 B.C.
Elisha used his final illness to teach Jehoash persistence and faithfulness, a lesson Jehoash failed to learn. The might it mentions is Jehoash's fighting against Amaziah king of Judah. Amaziah's rule in Judah, noted alongside Jehoash's reign, began well but ended wickedly.