2 Samuel 2:12-16

12Once Abner son of Ner and the troops of Saul’s son Ish-bosheth went out from Mahanaim to Gibeon.

13Meanwhile Joab son of Zeruiah and the troops of David went out—they met each other by the pool of Gibeon, so they sat down, one group on one side of the pool, and the other on the other side of the pool.

14Then Abner said to Joab, “Now let the young men get up and compete before us.” “Let them get up,” Joab replied.

15Then they got up and came forward by number—12 for Benjamin and for Saul’s son Ish-bosheth and 12 from David’s servants.

16Then each grasped his opponent by the head and thrust his sword in his opponent’s side; so they all fell down together. Therefore that place was called Helkath-hazzurim, which is in Gibeon.