3 From there David went to Mizpah in Moab and said to the king of Moab, “Would you let my father and mother come and stay with you until I learn what God will do for me?”
4 So he left them with the king of Moab, and they stayed with him as long as David was in the stronghold.
References for 1 Samuel 22:4
5 But the prophet Gad said to David, “Do not stay in the stronghold. Go into the land of Judah.” So David left and went to the forest of Hereth.