2 Kings 10:6-8

6Then he wrote a second letter to them saying, “If you are on my side, and if you will obey me, then bring the heads of the men, your master’s sons, and come to me to Jezreel at this time tomorrow.” Now the king’s sons, 70 people, were with the city’s prominent men.

7When it came to pass that the letter reached them, they took the king’s 70 sons and slaughtered them, put their heads in baskets and sent them to him at Jezreel.

8When a messenger came and told him saying, “They have brought the heads of the king’s sons,” he said, “Put them in two heaps at the entrance of the gate until morning.”