1 Chronicles 11:16-18

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

17David had a craving and said, “Oh that someone would give me a drink of water from the well of Bethlehem, which is next to the gate!”

18Then the three [mighty men] broke through the camp of the Philistines and drew water out of the well of Bethlehem which was next to the gate, and brought it to David. But David would not drink it; he poured it out to the Lord [as an offering];