2 Kings 10:6

Then he, feeling it to be an important matter to be acknowledged by all the people as soon as possible, wrote a letter the second time to them, saying, If ye be mine, if they had chosen, his part and stood on his side, and if ye will hearken unto my voice, take ye the heads of the men, your master's sons, and come to me to Jezreel by tomorrow this time. He expected them to do homage to him, but only in such a manner as to convince all the people that the pretenders to the crown, without exception, were dead, and that the most influential men of the kingdom had entirely broken with the house of Ahab. Now, the king's sons, being seventy persons, were with the great men of the city, which brought them up, they were in their care, in their power.