2 Kings 10:1-7, 11

Now Ahab had seventy sons in Samaria. And Jehu wrote letters and sent them to Samaria, to the rulers of Jezreel, the elders, and to the guardians of the children of Ahab, saying, “Now, when this letter comes to you, since your master’s sons are with you, as well as the chariots and horses and a fortified city and the weapons, select the best and fittest of your master’s sons, and set him on his father’s throne, and fight for your master’s house.” But they feared greatly and said, “Behold, the two kings did not stand before him; how then can we stand?” And the one who was over the household, and he who was over the city, the elders, and the guardians of the children, sent word to Jehu, saying, “We are your servants, all that you say to us we will do, we will not make any man king; do what is good in your sight.” Then he wrote a letter to them a second time saying, “If you are on my side, and you will listen to my voice, take the heads of the men, your master’s sons, and come to me at Jezreel tomorrow about this time.” Now the king’s sons, seventy persons, were with the great men of the city, who were rearing them. When the letter came to them, they took the king’s sons and slaughtered them, seventy persons, and 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 acquaintances and his priests, until he left him without a survivor.