Now Ahab had seventy sons in Samaria. And Jehu wrote and sent letters to Samaria, to the rulers of Jezreel, to the elders, and to those who reared Ahab’s sons, saying:
2 Now as soon as this letter comes to you, since your master’s sons are with you, and you have chariots and horses, a fortified city also, and weapons, 3 choose the best qualified of your master’s sons, set him on his father’s throne, and fight for your master’s house.
4 But they were exceedingly afraid, and said, “Look, two kings could not stand up to him; how then can we stand?” 5 And he who was in charge of the house, and he who was in charge of the city, the elders also, and those who reared the sons, sent to Jehu, saying, “We are your servants, we will do all you tell us; but we will not make anyone king. Do what is good in your sight.” 6 Then he wrote a second letter to them, saying:
If you are for me and will obey my voice, take the heads of the men, your master’s sons, and come to me at Jezreel by this time tomorrow.
Now the king’s sons, seventy persons, were with the great men of the city, who were rearing them. 7 So it was, when the letter came to them, that they took the king’s sons and slaughtered seventy persons, put their heads in baskets and sent them to him at Jezreel.
8 Then a messenger came and told him, saying, “They have brought the heads of the king’s sons.”
And he said, “Lay them in two heaps at the entrance of the gate until morning.”
9 So it was, in the morning, that he went out and stood, and said to all the people, “You are righteous. Indeed I conspired against my master and killed him; but who killed all these? 10 Know now that nothing shall fall to the earth of the word of the Lord which the Lord spoke concerning the house of Ahab; for the Lord has done what He spoke by His servant Elijah.” 11 So Jehu killed all who remained of the house of Ahab in Jezreel, and all his great men and his close acquaintances and his priests, until he left him none remaining.
12 And he arose and departed and went to Samaria. On the way, at Beth Eked of the Shepherds, 13 Jehu met with the brothers of Ahaziah king of Judah, and said, “Who are you?”
So they answered, “We are the brothers of Ahaziah; we have come down to greet the sons of the king and the sons of the queen mother.”
14 And he said, “Take them alive!” So they took them alive, and killed them at the well of Beth Eked, forty-two men; and he left none of them.
15 Now when he departed from there, he met Jehonadab the son of Rechab, coming to meet him; and he greeted him and said to him, “Is your heart right, as my heart is toward your heart?”
And Jehonadab answered, “It is.”
Jehu said, “If it is, give me your hand.” So he gave him his hand, and he took him up to him into the chariot. 16 Then he said, “Come with me, and see my zeal for the Lord.” So they had him ride in his chariot. 17 And when he came to Samaria, he killed all who remained to Ahab in Samaria, till he had destroyed them, according to the word of the Lord which He spoke to Elijah.
2 Kings 10:1-17