God responds to the Israelites' desperate cries with a sharp historical rebuke. By reminding them of His past kindnesses, He highlights their deep ingratitude while simultaneously affirming His enduring power to save them. The primary approach among commentators is that God did not deliver this message directly, but rather spoke through a prophet. The purpose of this prophetic warning was to confront the people with their wrongdoings, laying out their sins so clearly that they could never claim innocence [מלבי״ם].
The historical reminder begins with the rescue from Egypt, specifically recalling their liberation from the crushing hardship of slavery [מצודת דוד]. This opens a broader list of nations from which God delivered the Israelites, totaling seven distinct acts of salvation. This specific number is deliberate, perfectly mirroring the seven different types of idols the Israelites were actively worshiping at that time [רש״י].
However, the inclusion of certain nations in this list raises a chronological difficulty. The Israelites were still suffering under the oppression of the Ammonites and the Philistines and had not yet been rescued from their grip. Therefore, this historical review serves as a direct comparison between the past and the present. God is clarifying to the Israelites that just as He successfully rescued them in ancient times from Egypt and the Amorites, He retains the absolute power to save them right now from the Ammonites and Philistines who are currently oppressing them [מלבי״ם].