2 Samuel 23:13-17 New Revised Standard Version (NRSV)
13 Towards the beginning of harvest three of the thirty[a] chiefs went down to join David at the cave of Adullam, while a band of Philistines was encamped in the valley of Rephaim. 14 David was then in the stronghold; and the garrison of the Philistines was then at Bethlehem. 15 David said longingly, “O that someone would give me water to drink from the well of Bethlehem that is by the gate!” 16 Then the three warriors broke through the camp of the Philistines, drew water from the well of Bethlehem that was by the gate, and brought it to David. But he would not drink of it; he poured it out to the Lord, 17 for he said, “The Lord forbid that I should do this. Can I drink the blood of the men who went at the risk of their lives?” Therefore he would not drink it. The three warriors did these things.