2 Samuel 2:12-13

Abner son of Ner and the servants of Ish-Bosheth son of Saul left Mahanaim and went to Gibeon. Joab son of Zeruiah and David’s men also went there and met Abner and Ish-Bosheth’s men at the pool of Gibeon. Abner’s group sat on one side of the pool; Joab’s group sat on the other.