Meanwhile, Ish-Bosheth, the only son of Saul left, was made king by Abner, a relative of Saul. "The war between the house of Saul and the house of David lasted a long time. David grew stronger and stronger, while the house of Saul grew weaker and weaker.", Later, Abner slept with one of Saul's concubines, and Ish-Bosheth asked, "Why did you sleep with my father's concubine?" Ish-Bosheth suspected that Abner wanted to be king instead of him (sleeping with the concubine of a king was thought very important). Abner became very angry and decided to help David instead. However, Joab, the commander of David's army, did not like Abner because Abner had killed his brother. Maybe he also thought his job as the leader of the army would not be safe if Abner helped David, because Abner was very powerful in the northern tribes of Israel. So, Joab killed him by stabbing him in the stomach. David cursed Joab for murdering Abner and said that he did not join in the killing.