1 Chronicles 11:16-19

16At that time, David was in the stronghold, while the garrison of the Philistines was in Bethlehem.

17David had a craving and said, “If only someone would give me water to drink from the cistern by the gate in Bethlehem!”

18So the three broke through the Philistine camp and drew water from the cistern by the gate in Bethlehem and carried it back to David. But David refused to drink it. He poured it out to Adonai

19and said: “Far be it for me that I should do this before my God! Can I drink the blood of these men who risked their lives?”—for they brought it at the risk of their lives and he would not drink it. Such were the exploits of the Three mighty men.