After Saul and his whole family died, his dead son Ish-Bosheth succeeded him as king of Israel. But David was made king of the tribe of Judah. The commander of the army of Israel was Saul’s cousin Abner, and the commander of the army of Judah was David’s nephew Joab.
These commanders thought it would be fun to see some men stab each other to death. So they made two dozen of their soldiers stab each other to death. But Joab’s brother Asahel didn’t like that, so he chased Abner. Abner didn’t like that, so he stabbed Asahel to death. Joab didn’t like that, so he chased Abner, too. But then Abner suggested not chasing him. So Joab stopped chasing him.
King Ish-Bosheth offended his commander Abner by accusing him of sleeping with Saul’s girlfriend. So Abner decided to desert Ish-Bosheth and help David take over Israel. When Abner offered to help David become king of all Israel, David agreed to let him do that… but only if he did David a favor first.
By this time David had married at least four women. But Saul had taken back his daughter Michal, David’s first wife, and given her to somebody else. David had Abner steal Michal back for him and make her other husband go away. After doing that, Abner went off to convince the Israelites to make David their king.
But David’s commander Joab didn’t like Abner, who had killed Joab’s brother. Joab thought Abner must have only come there to spy on David for Ish-Bosheth. So Joab found Abner and stabbed him to death. David didn’t like that (even though he had previously declared that Abner must die). So David put a curse on Joab’s family, and later had his son kill Joab.
Then two other men who worked for Ish-Bosheth stabbed Ish-Bosheth to death while he was taking a nap. They cut off his head and brought it to David. They thought David would like that they had killed that innocent man. But David didn’t like it, so he had them killed. Then he took over the innocent man’s kingdom.
The moral of the story
Don’t let any of your relatives murder anyone, or you might get killed with a sword while starving and leaning on a crutch with running sores and leprosy.