1 Chronicles 11:15-19

Now three of the thirty chief men went down to the rock to David, into the cave of Adullam, while the army of the Philistines was camping in the Valley of Rephaim.

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

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

So the three broke through the camp of the Philistines and drew water from the well of Bethlehem which was by the gate, and took it and brought it to David; however, David would not drink it, but poured it out to the Lord;

and he said, “Far be it from me before my God that I would do this. Shall I drink the blood of these men who went at the risk of their lives? For they brought it at the risk of their lives.” Therefore he would not drink it. The three mighty men did these things.