2 Samuel 23:13-17

13Once the three of the thirty chiefs went down and came to David at the cave of Adullam during the harvest, while a troop of Philistines was camping in the Valley of Rephaim.

14David was then in the stronghold, while the garrison of the Philistines was in Bethlehem.

15David said longingly, ‘“Who would get me water to drink from the well which is by the gate in Bethlehem?’”

16So the three mighty men broke through the Philistine lines, drew water from the well of Bethlehem by the gate, took it and brought it to David. However, he would not drink it but poured it out to Adonai

17and he said, “‘Far be it from me, Adonai, that I should do this—the blood of the men who went in jeopardy of their lives?’” So he would not drink it. These things the three mighty men did.