2 Samuel 23:14-16

14David was staying in the stronghold at the time, and a Philistine detachment had occupied the town of Bethlehem.

15David remarked longingly to his men, “Oh, how I would love some of that good water from the well by the gate in Bethlehem.”

16So the Three broke through the Philistine lines, drew some water from the well by the gate in Bethlehem, and brought it back to David. But he refused to drink it. Instead, he poured it out as an offering to the Lord.