2 Kings 10:1-3

Now there were in Samaria seventy of Ahab's sons. And Jehu sent letters to Samaria, to the rulers of the town, and to the responsible men, and to those who had the care of the sons of Ahab, saying, Straight away, when you get this letter, seeing that your master's sons are with you, and that you have carriages and horses and a walled town and arms; Take the best and most upright of your master's sons, and make him king in his father's place, and put up a fight for your master's family.