1 Chronicles 11:15-17

15Now three of the thirty chief men went down to the rock to David, into the cave of Adullam; and the army of the Philistines encamped in the Valley of Rephaim.

16David was then in the stronghold, and the garrison of the Philistines was then in Bethlehem.

17And David said with longing, “Oh, that someone would give me a drink of water from the well of Bethlehem, which is by the gate!”