Yahweh said to him, "Call his name Jezreel; for yet a little while, and I will avenge the blood of Jezreel on the house of Jehu, and will cause the kingdom of the house of Israel to cease.
"I will avenge the blood of Jezreel upon the house of Jehu ..."  The blood of Jezreel probably refers to all of the many vicious and godless crimes perpetrated there, but the particular application would seem to be to Jehu's inhumane and ruthless murder of the house of Ahab, in which one of the kings of Judah, Ahaziah, was also slain.  God, through one of his prophets, had commanded Jehu to destroy the house of Ahab; but the brutal and inhuman manner in which he did it showed that: