2nd Samuel 2:11

8 Now Abner, the son of Ner, captain of Saul's army, had taken Saul's son Ish-bosheth over to Mahanaim,

9 And made him king over Gilead and the Asherites and over Jezreel and Ephraim and Benjamin, that is, over all Israel.

10 (Saul's son Ish-bosheth was forty years old when he became king over Israel, and he was ruler for two years.) But Judah was on the side of David.

11 And the time when David was king in Hebron over the people of Judah was seven years and six months.

12 And Abner, the son of Ner, with the servants of Saul's son Ish-bosheth, went out from Mahanaim to Gibeon.

13 And Joab, the son of Zeruiah, and the servants of David, went out and came face to face with them by the pool of Gibeon; and they took up their position, facing one another on opposite sides of the pool.

14 And Abner said to Joab, Let the young men give a test of their strength before us. And Joab said, Let them do so.