Then Jehu wrote them a second letter, saying: If you are on my side, and if you will obey me, bring me the heads of your master's sons at this time tomorrow at Jezreel. All 70 of the king's sons were being cared for by the city's prominent men.
When the letter came to them, they took the king's sons and slaughtered all 70, put their heads in baskets, and sent them to Jehu at Jezreel.
When the messenger came and told him, "They have brought the heads of the king's sons," the king said, "Pile them in two heaps at the entrance of the gate until morning."
The next morning when he went out and stood [at the gate], he said to all the people, "You are innocent. It was I who conspired against my master and killed him. But who struck down all these?
Know, then, that not a word the LORD spoke against the house of Ahab will fail, for the LORD has done what He promised through His servant Elijah."