What is the significance of the word "Rega"?
Rashi: It signifies the moment that Hashem's anger lasts. 1
Seforno: Hashem was telling the people not to mourn the fact that I will remove My Shechinah from their midst. Since you are stiff-necked and do not turn to hear your teachers, if I would be among you, I would consume you in a moment, even though you acquired preparation for perfection on Har Sinai! 2
What is the connection between the first half of the Pasuk and the second half?
Rashi: Even though Hashem was about to send a Mal'ach, to prevent His Shechnah from destroying Yisrael should they sin, the punishment of the ornaments was to take effect immediately and Hashem had already decided how He would punish them to atone for the rest of the sin. 1
Seforno: Since this demotion was necessary, they should remove their spiritual preparedness 2 that they received at Ma'amad Har Sinai.
Hadar Zekenim: Hashem said, since I will not go with you, remove your weapons, until I decide what to do with you, i.e. whether or not to go with you.
Why did Hashem see fit to ask the people to remove their ornaments?
Seforno: Because, once Hashem gives a present, He does not take it away without the recipient's consent. 1
Sha'arei Teshuvah (1:29): Hachna'ah (submissiveness) in action is a part of Teshuvah. One should not engage in beauty of clothing and ornaments.
As the Gemara states in Ta'anis, 25a).
What did Hashem mean when He said "v'Ed'ah Mah E'eseh Lach"?
Rashi: Refer to 33:5:2:1.
Seforno: Once they remove the above-mentioned 'preparedness', they would no longer be subject to such a severe punishment.
Targum Onkelos and Targum Yonasan: 'Because it is reealed before Me what I will do to you'.
Moshav Zekenim citing the Rosh: I will punish them according to My knowledge, based on their mourning and regret of their sin.
Moshav Zekenim: I will give to them Yom Kipur to atone for them.
Hadar Zekenim: I will decide what to do with you, i.e. whether or not to go with you. This is why Moshe said (verse 12) 'You did not inform me' (what You decided).
Why did Hashem say "E'eleh (I will ascend) amidst you"?