1)
Which Nevi'im did Hashem not send?
1.
Radak, Malbim: The false Nevi'im.
2)
Why does it say "v'Hem Ratzu"?
1.
Radak: They rushed to say in My name words that they made up in their hearts.
3)
What does "Lo Dibarti" add?
1.
Malbim: Do not say that I spoke to them, just I did not send them to tell the nation. I did not speak to them at all!