God will punish the Egyptians, not only the people, but also their gods (Exodus 12:12; Numbers 33:4). His purpose is the liberation of Israel (compare with Exodus 3:8; Exodus 6:6).
This is how Israel becomes a nation that serves the Lord, a nation that knows that God liberated them (Exodus 6:7) and a nation that sings his praises (see Exodus 15:1–27).
4 Pharaon ne vous écoutera point. Je mettrai ma main sur l'Egypte, et je ferai sortir du pays d'Egypte mes armées, mon peuple, les enfants d'Israël, par de grands jugements.