2 Samuel 23:14-16

14David was in his strong safe place. A group of Philistine soldiers had made their home in Bethlehem.

15David was very thirsty. He said, ‘I want someone to bring water from the well near Bethlehem's gate for me to drink.’

16So the three brave soldiers fought through the Philistine camp and they reached Bethlehem's gate. They took some water from the well there and they carried it back to David. But he refused to drink it. He poured it on the ground as an offering to the Lord.