2 Kings 10:6-7

6Then he wrote them a letter a second time, saying, “If you are on my side, and will listen to my voice, take the heads of the men, your master’s sons, and come to me at Jezreel about this time tomorrow.” Now the king’s sons, seventy men, were with the great people of the city, who were raising them.

7When the letter came to them, they took the king’s sons and 1slaughtered them, seventy men, and put their heads in baskets, and sent them to him at Jezreel.