1 Chronicles 11:15-20

15Three of the thirty chief men went down to David, to the rock at the cave of Adullam, while a company of Philistines was encamped in the Valley of Rephaim. 16At that time David was in the stronghold, and the garrison of the Philistines was at Bethlehem. 17David longed for water and said, “Oh, that someone would get me a drink of water from the well near the gate of Bethlehem!”

18So the Three broke through the Philistine camp, drew water from the well at the gate of Bethlehem, and brought it back to David. But he refused to drink it; instead, he poured it out to the LORD, 19saying, “Far be it from me, my God, to do this! How can I drink the blood of these men who risked their lives?” Because they had brought it at the risk of their lives, David refused to drink it.

Such were the exploits of the three mighty men.

20Now Abishai, the brother of Joab, was chief of the Three,1 and he wielded his spear against three hundred men, killed them, and won a name along with the Three.