1 Chronicles 11:15-17

15Once three of the thirty leading men went down to David’s rock at the cave of Adullam when the army of the Philistines was camping in the valley of Rephaim.

16While David was in the fortified camp, Philistine troops were in Bethlehem.

17David was thirsty and said, “I wish I could have a drink of water from the cistern at the city gate of Bethlehem.”