2 Samuel 2:8-10

Now [Saul’s cousin] Abner the son of Ner, commander of Saul’s army, had taken Ish-bosheth the son of Saul and brought him over to Mahanaim. He made him king over Gilead, over the Ashurites, over Jezreel, over Ephraim, over Benjamin, even over all Israel [except Judah]. Ish-bosheth, Saul’s son, was forty years old when he became king over Israel, and he reigned for two years. But the house of Judah followed David.