2 Samuel 2:12-13

Now Abner the son of Ner and the servants of Ish-bosheth the son of Saul went out from Mahanaim to Gibeon. Joab [David’s nephew] the son of Zeruiah and the servants of David also went out and met them by the pool of Gibeon. They sat down, with one group on one side of the pool and the other group on the other side of the pool.