2 Samuel 2:8-10

8But Abner son of Ner, the commander of Saul’s army, had already gone to Mahanaim with Saul’s son Ishbosheth.

9There he proclaimed Ishbosheth king over Gilead, Jezreel, Ephraim, Benjamin, the land of the Ashurites, and all the rest of Israel.

10Ishbosheth, Saul’s son, was forty years old when he became king, and he ruled from Mahanaim for two years. Meanwhile, the people of Judah remained loyal to David.