2 Samuel 23:13
And three of the thirty chief went down, and came to David in the harvest time unto the cave of Adullam: and the troop of the Philistines pitched in the valley of Rephaim. And three of the thirty chief went down, and came to David in the harvest time unto the cave of Adullam: and the troop of the Philistines pitched in the valley of Rephaim.
David and his men were at the cave of Adullam while the Philistines held Bethlehem and were pitched in the valley of Rephaim. Three of his mighty men broke through the Philistine guard to bring him water from Bethlehem. He would not drink the water because the men had risked their lives to get it, so he regarded it as too sacred to drink. Instead he poured the water out as an offering to God. His response shows his regard for human life and that he did not treat it lightly.