1 Samuel 22:2-4

2 People who were oppressed or in debt or dissatisfied went to him, about four hundred men in all, and he became their leader.

3 David went on from there to Mizpah in Moab and said to the king of Moab, "Please let my father and mother come and stay with you until I find out what God is going to do for me."

4 So David left his parents with the king of Moab, and they stayed there as long as David was hiding out in the cave.