Why did he say "v'Gam Ad Ziknah..."?
Radak: Just like You did not abandon me until now, also until Ziknah v'Seivah.
What is "Ad Ziknah v'Seivah"?
Rashi: When I will reach 60 and 70 years [do not abandon me]. Radak - we find that Ziknah is before Seivah - "va'Ani Zakanti va'Savti" (Shmuel I, 12:2).
What is the meaning of "Ad Agid Zero'acha l'Dor"?
Radak, Malbim: If I will defeat my enemies at the time of Ziknah, all will say that Your hand saved me, and not my strength. I will tell the generation in which I am. Malbim - the Zero'a (arm) is the primary force behind the hand.
What is "l'Chol Yavo"?
Rashi: Anyone who comes to me, I will tell to him Your Gevuros.
Radak #1: The remnants of this generation will tell every generation to come [of Your Gevuros].
Radak #2: I will tell all generations to come of Your Gevuros via writing them in a Sefer.
Malbim: I will tell also coming generations.
