1 Samuel 22:3 (KJV)

David therefore departed thence, and escaped to the cave Adullam: and when his brethren and all his father’s house heard it, they went down thither to him.

And every one that was in distress, and every one that was in debt, and every one that was discontented, gathered themselves unto him; and he became a captain over them: and there were with him about four hundred men.

And David went thence to Mizpeh of Moab: and he said unto the king of Moab, Let my father and my mother, I pray thee, come forth, and be with you, till I know what God will do for me.

And he brought them before the king of Moab: and they dwelt with him all the while that David was in the hold.

And the prophet Gad said unto David, Abide not in the hold; depart, and get thee into the land of Judah. Then David departed, and came into the forest of Hareth.