'Stronghold' in the Bible

David left them with the king of Moab, and they stayed with him all the time David was in the stronghold.

The prophet Gad told David, "Don't remain in the stronghold. Go and enter the territory of Judah." So David left and went into the forest of Hereth.

David made this vow to Saul, and then Saul went home, while David and his men went up to the stronghold.