2 Kings 10:6-8

6So Jehu wrote a second letter to them. It said, ‘If you are ready to help me and you will obey me, do this: Bring the heads of your master's sons here to me in Jezreel. Bring them by this time tomorrow.’ At that time, important leaders of the city were taking care of the king's 70 sons.

7When the letter arrived, these men took hold of the king's sons. They killed all 70 of them. They put their heads in baskets. Then they sent them to Jehu in Jezreel.

8Someone told Jehu, ‘They have brought the heads of the king's sons.’ Then Jehu said, ‘Put them in two heaps at the gate of the city. Leave them there until the morning.’