2 Kings 10:14
And he said, Take them alive. And they took them alive, and slew them at the pit of the shearing house, even two and forty men; neither left he any of them.
Cross-reference
2 Kings 10:10 states the Lord's word against Ahab's house is fulfilled; Jehu's killing of these relatives extends that judgment.
In 2 Kings 10:11, the same purge is described more broadly — the 42 men here are part of Jehu's elimination of Ahab's entire house.
2 Kings 10:6 shows Jehu ordering the heads of Ahab's sons; here he kills Ahaziah's relatives, both parts of his purge.
2 Kings 8:18 shows Jehoram married Ahab's daughter, explaining why these 42 relatives of Ahaziah were part of Ahab's line — targeted by Jehu.
2 Kings 11:1 records Athaliah's slaughter of the royal seed after Jehu's killings — mirroring the purge but with different victims and motives.
2 Chronicles 22:8 is the parallel account of the same event — Jehu kills the princes of Judah and Ahaziah's brothers' sons here.
2 Chronicles 22:6 explains that Ahaziah was in Jezreel visiting sick Jehoram — this is why he and his 42 relatives were present when Jehu struck.
2 Chronicles 22:10 records Athaliah's destruction of the royal seed after Jehu's purge, same as 2 Kings 11:1 — a parallel massacre.