שמואל ב, פרק י״ב, פסוק כ״ז

During a military campaign, Joab sends an update to David about the progress of the battle. He reports a major strategic victory, announcing the successful capture of the enemy's water supply. This captured area was a specific district that held the vital water sources for the region [ביאור שטיינזלץ]. More than just a basic resource hub, this district was actually the royal city itself, which controlled and supplied water to all the residents of Rabbah [מצודת דוד].