1)
What is the meaning of the dual phrase "Lo Yarp'cha ve'Lo Ya'azveka"?
1.
Rashi: It means that Hashem will not loosen His hold on you in order to abandon you.
2.
Seforno: It means that He will not loosen His hold on you - 'He will hold your hand' - during war-time, and will not abandon you - 'not remove His Hashgachah from you' - after the war.
3.
Targum Yonasan: It means that He will not forsake you and will not distance you from Him.