In the beginning of Ekev, Moshe describes wonderful things that will befall the Jews when they adhere to God's will. It says among them (7:16–19) that "you shall consume all the peoples…. Will you say to yourself, 'These nations are more numerous than I; how will I be able to drive them out'? You shall not fear them. You shall surely remember what the Lord, your God, did to Pharaoh and to all of Egypt: The great trials that your eyes saw, the signs, the wonders, the mighty hand, and the outstretched arm with which the Lord, your God, brought you out. So will the Lord, Your God, do to all the peoples you fear." (Judaica Press translation.)
My kid asked: It seems Moshe picked the wrong question-answer combination. If the Jews' concern is that the nations would be more numerous, how is a reference to Egypt mollifying? The Jews were seemingly more numerous than the Egyptians (see "more numerous… than we are" in Sh'mos 1:7–9).
(I very tentatively propose that the analogue here is that the many Jews who left Egypt are being compared to the many gentiles who will leave Canaan or be killed. Alternatively, that the Egyptians' oppression (after Sh'mos 1:9) killed out enough Jews that the Jews did not outnumber them. But if either of those is the explanation, I'd love to see some source that says so.)