2 Kings 10:6-9

Then he wrote a letter the second time to them, saying, If ye be on my 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 to-morrow this time. Now the king’s sons, being seventy persons, were with the great men of the city, who brought them up. And it came to pass, when the letter came to them, that they took the king’s sons, and slew them, even seventy persons, and put their heads in baskets, and sent them unto him to Jezreel. And there came a messenger, and told him, saying, They have brought the heads of the king’s sons. And he said, Lay ye them in two heaps at the entrance of the gate until the morning. And it came to pass in the morning, that he went out, and stood, and said to all the people, Ye are righteous: behold, I conspired against my master, and slew him; but who smote all these?