1 Chronicles 11:15-17

15Once when David was at the rock near the cave of Adullam, the Philistine army was camped in the valley of Rephaim. The Three (who were among the Thirty—an elite group among David’s fighting men) went down to meet him there.

16David was staying in the stronghold at the time, and a Philistine detachment had occupied the town of Bethlehem.

17David remarked longingly to his men, “Oh, how I would love some of that good water from the well by the gate in Bethlehem.”