The letter said: “Put Uriah on the front line where the fighting is the worst. Then pull the troops back from him, so that he will be wounded and die.”
Don't you know how Abimelech the son of Gideon was killed at Thebez? Didn't a woman kill him by dropping a large rock from the top of the city wall? Why did you go so close to the city walls?” Then you tell him, “One of your soldiers who was killed was Uriah the Hittite.”
When Abner returned to Hebron, Joab pretended he wanted to talk privately with him. So he took Abner into one of the small rooms that were part of the town gate and stabbed him in the stomach. Joab killed him because Abner had killed Joab's brother Asahel.
Solomon, don't forget what Joab did to me by killing Abner son of Ner and Amasa son of Jether, the two commanders of Israel's army. He killed them as if they were his enemies in a war, but he did it when there was no war. He is guilty, and now it's up to you to punish him
Jehu then wrote another letter which said, “If you are on my side and will obey me, then prove it. Bring me the heads of the descendants of Ahab! And be here in Jezreel by this time tomorrow.” The seventy descendants of King Ahab were living with some of the most important people of the city.