1)
Why does it say "Ki Ani"?
1.
Radak: Since I tell you not to fear, you will be confident, "Ki Lo Ish Kel vi'Ychazev" (Bamidbar 23:19).
2)
What is the significance of holding the right hand?
1.
Malbim: There are two reasons why one does not stand in war. (a) Due to weakness and slackening. I hold your right hand (give to you strength to fight)! Also refer to 41:13:3:1.
3)
Why does it say "Al Tira Ani Azarticha"?
1.
Malbim: A second reason why one does not stand in war is due to fear and a soft heart. You need not fear!