1)
Why did he say "Ki Az Tisa Panecha mi'Mum"?
1.
Rashi: If you were sure that you will raise his face from any blemish (sin)...
2.
Malbim: Only then (if you distance sin from your hands, and house), your face will be raised from blemish. If you sinned, the Mum is on your face, for you chose to sin.
2)
What is "Mutzak"?
1.
Rashi: It is strong, like "Metzukei Eretz."
3)
Why did he say "you will not fear"?
1.
Malbim: You have choice, and you can do good and Tzedek if you distance Aven and Avlah.
