2SA 2:10

10 Ishbosheth, the son of Saul, was of forty years, when he began to reign upon Israel; and he reigned two years. Soothly the house alone of Judah followed David. (Ishbosheth, the son of Saul, was forty years old when he began to reign upon Israel; and he reigned for two years. Only the house of Judah followed David.)