2 Samuel 23:14-16

14David was in the stronghold at the time, while a Philistine garrison was in Bethlehem.

15David was thirsty and said, “How I wish someone would give me some water to drink from the cistern in Bethlehem near the gate!”

16So the three elite warriors broke through the Philistine forces and drew some water from the cistern in Bethlehem near the gate. They carried it back to David, but he refused to drink it. He poured it out as a drink offering to the Lord