Ahab had seventy sons living in Samaria. ¹  So Jehu wrote letters and sent them to Samaria to the leading officials of Jezreel and to the guardians of Ahab’s dynasty. This is what the letters said, ² 

When they received the letter, they seized the king’s sons and executed all seventy of them. ¹  They put their heads in baskets and sent them to him in Jezreel.

He wrote them a second letter, saying, “If you are really on my side and are willing to obey me, ¹  then take the heads of your master’s sons and come to me in Jezreel at this time tomorrow.” ²  Now the king had seventy sons, and the prominent ³  men of the city were raising them.