1 Chronicles 11:15-17

15Three of the 30 leaders went down to David at the rock at the cave of Adullam, while a band of the Philistines was encamped in the valley of Rephaim.

16At that time, David was in the stronghold, while the garrison of the Philistines was in Bethlehem.

17David had a craving and said, “If only someone would give me water to drink from the cistern by the gate in Bethlehem!”