2 Samuel 23:15-17

David had a strong desire for some water. He said, “Oh, I wish someone would get me water from the well near the city gate of Bethlehem!” So the three warriors broke through the Philistine army and took water from the well near the city gate of Bethlehem. Then they brought it to David, but he refused to drink it. He poured it out before the LORD, saying, “May the LORD keep me from drinking this water! It would be like drinking the blood of the men who risked their lives!” So David refused to drink it. These were the brave things that the three warriors did.