2 Samuel 2:11

Now Abner the son of Ner, captain of Saul’s army, had taken Ishbosheth 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, and over all Israel.

Ishbosheth, Saul’s son, was forty years old when he began to reign over Israel, and he reigned two years. But the house of Judah followed David.

Abner the son of Ner, and the servants of Ishbosheth the son of Saul, went out from Mahanaim to Gibeon.

Joab the son of Zeruiah and David’s servants went out, and met them by the pool of Gibeon; and they sat down, the one on the one side of the pool and the other on the other side of the pool.

Abner said to Joab, “Please let the young men arise and compete before us!”

Joab said, “Let them arise!”