II Kings 10:1-7, 11

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: 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, choose the best qualified of your master’s sons, set him on his father’s throne, and fight for your master’s house. But they were exceedingly afraid, and said, “Look, two kings could not stand up to him; how then can we stand?” 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.” 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. 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.

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.