1 Chronicles 11:18-19

Then 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]; and he said, “Far be it from me before my God that I would do this thing! Shall I drink the blood of these men who have put their lives in jeopardy? For they brought it at the risk of their lives.” So he would not drink it. These things the three mighty men did.