1)
Why does it say "b'Yad Chagai ha'Navi"?
1.
Radak: His Nevu'ah was a Shelichus to them, to do what Hashem will command.
Why does it say "b'Yad Chagai ha'Navi"?
Radak: His Nevu'ah was a Shelichus to them, to do what Hashem will command.