1 Samuel 24:1-3

After Saul returned from fighting the Philistines, he was told that David had gone into the wilderness of En-gedi. So Saul chose 3,000 elite troops from all Israel and went to search for David and his men near the rocks of the wild goats. At the place where the road passes some sheepfolds, Saul went into a cave to relieve himself. But as it happened, David and his men were hiding farther back in that very cave!