2 Samuel 23:13-17

Then three of the thirty chief men went down and came to David in the harvest time to the cave of Adullam, while the troop 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. 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 mighty men 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. Nevertheless he would not drink it, but poured it out to the LORD; and he said, “Be it far from me, O LORD, that I should do this. Shall I drink the blood of the men who went in jeopardy of their lives?” Therefore he would not drink it. These things the three mighty men did.