Cave of Adullam
David sheltered in the cave of Adullam from Saul, and 400 discontents joined him
As David was fleeing Saul, he departed from Achish and escaped to the cave of Adullam. When his brothers and all his fathers house heard it, they joined him, as did everyone in distress, everyone who was in debt, and everyone who was bitter in soul, until he was captain of 400 men. Then David went to Mizpeh of Moab. (1 Samuel 22:1-3)
David's three fetch him water from the well of Bethlehem at risk of their lives
The three mighty men also came about harvest time to David at the cave of Adullam when a Philistine band was encamped in the Valley of Rephaim. David was in the stronghold, and the Philistine garrison was at Bethlehem. David said, “Oh, that someone would give me water to drink from the well of Bethlehem that is by the gate!” The three mighty men broke through the Philistine camp to fetch David's water, but David poured it out to the LORD. “Far be it from me, O Lord, that I should do this. Shall I drink the blood of the men who went at the risk of their lives?” (2 Samuel 23:13-17)