7Now Saul had a concubine whose name was Rizpah, the daughter of Aiah. And Ish-bosheth said to Abner, “Why have you gone in to my father’s concubine?”
A concubine is equivalent to a girlfriend or a mistress, a woman who is not a wife but still romantically engaged and connected with a man. In this case the woman is called Rizpah and she was close to Saul.
7 Now Saul had a concubine whose name was Rizpah, the daughter of Aiah. And Ish-bosheth said to Abner, “Why have you gone in to my father’s concubine?”