Nevertheless they shall be. — For they shall become servants (i.e., tributaries) to him; scil., for a while.
That they may know (or, discern) my service, and the service of the kingdoms. — That they may learn by experience the difference between the easy yoke of their God, and the heavy burden of foreign tyranny, which was entailed upon them by deserting Him.
Kingdoms of the countries. — See 1 Chronicles 29:30.