1)
Verse 20 said "I will save you." Why is this repeated?
1.
Malbim: Also when they gather against you to do evil to you [I will save you].
2)
Who are the "Ra'im" and "Aritzim"?
1.
Radak: They are those who want to kill you.
3)
Why does it say "u'Fdisicha"?
1.
Malbim: Even if you are already in their hands, and they put you in jail to kill you, I will redeem you, like he was saved via the servant of Melech ha'Kushi.