'Stronghold' in the Bible

And he brought them before the king of Moab; and they abode with him all the while that David was in the stronghold.

And the prophet Gad said to David, Abide not in the stronghold; depart, and go into the land of Judah. Then David departed, and came into the forest of Hareth.

And David swore to Saul. And Saul went home; and David and his men went up to the stronghold.