I Samuel 22:1-5

David therefore departed from there and escaped to the cave of Adullam. So when his brothers and all his father’s house heard it, they went down there to him. And everyone who was in distress, everyone who was in debt, and everyone who was discontented gathered to him. So he became captain over them. And there were about four hundred men with him. Then David went from there to Mizpah of Moab; and he said to the king of Moab, “Please let my father and mother come here with you, till I know what God will do for me.” So he brought them before the king of Moab, and they dwelt with him all the time that David was in the stronghold. Now the prophet Gad said to David, “Do not stay in the stronghold; depart, and go to the land of Judah.” So David departed and went into the forest of Hereth.