1)
What is the meaning of "v'Nilvu"?
1.
Rashi: They will join.
2.
Malbim: They will convert and accept the true creed.
2)
What do we learn from "v'Shachanti b'Sochech"?
1.
Malbim: Hashem will dwell amidst Yisrael [and not among the converts] ? "v'His'halechti b'Sochechem" (Vayikra 26:12).
3)
Why does it repeat "you will know that Hashem sent me to you"? Verse 13 said so!
1.
Malbim: Before he was sent to warn the nations. This Shelichus is to herald you that there is hope.