וְכַאֲשֶׁר֙ יְעַנּ֣וּ אֹת֔וֹ כֵּ֥ן יִרְבֶּ֖ה וְכֵ֣ן יִפְרֹ֑ץ וַיָּקֻ֕צוּ מִפְּנֵ֖י בְּנֵ֥י יִשְׂרָאֵֽל׃
但他們越是苦害這民，這民就越發增多，越發擴展；埃及人便因以色列人而厭煩不安。
Rashi
וכאשר יענו אתו AND AS THEY AFFLICTED THEM — In whatsoever matter it was that they set their hearts upon afflicting them so was the heart of the Holy One, blessed be He, set upon multiplying them and making them grow apace.
Ibn Ezra
1} When they afflicted them--despite the affliction, the people continued to increase as they had before.
Rashbam
כן ירבה; the measures the Egyptians took to slow down the Jewish birthrate not only did not work but backfired.
Or HaChaim
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כן ירבה signifies: so they multiplied and so they grew apace (i. e. God’s determination was carried out, the imperfect tenses of the verbs denoting the continuance of the increase and growth). This is the real meaning; but there is a Midrashic explanation of these imperfect tenses: The Holy spirit (God) said this: You say פן ירבה, “lest they increase”, but “I” say כן ירבה, “thus will they assuredly increase” (Sotah 11a).