1)
Who will know that Hashem did this?
1.
Radak: All will know that the salvation is from You for me.
2)
Why does it say "Atah Hashem Asisa"?
1.
Radak: It was not my power or strength.
2.
Malbim: (a) They will know that the salvation is not nature, rather, it is special to Your hand and power. (b) Refer to 109:28:1:2.
