Ish-bosheth and Abner fight
Ish-bosheth accused Abner of sleeping with one of Saul’s concubines, and Abner was angry.
Key passages
2 Sa 3:6–11

As the war between the house of Saul and the house of David was continuing, Abner was strengthening himself in the house of Saul. Saul had had a concubine, and her name was Rizpah the daughter of Aiah. Then Ish-Bosheth said to Abner, “Why did you have sex with my father’s concubine?” …

See also