וְאוּלָ֗ם בַּעֲב֥וּר זֹאת֙ הֶעֱמַדְתִּ֔יךָ בַּעֲב֖וּר הַרְאֹתְךָ֣ אֶת־כֹּחִ֑י וּלְמַ֛עַן סַפֵּ֥ר שְׁמִ֖י בְּכָל־הָאָֽרֶץ׃
Но в самом деле для этой цели Я заставил тебя встать, показать Тебе Мою силу и чтобы Мое имя могло быть провозглашено по всей земле.
Chizkuni
ולמען ספר את שמי בכל הארץ, “and in order to spread My fame in the whole country, (or on the whole earth).” G-d continues to respond “tit for tat,” seeing that Pharaoh had denied His existence, not to acknowledge His power, G-d will make sure that he will see how wrong he had been, and he would have to do so publicly.
Rashbam
NEVERTHELESS I HAVE SPARED YOU FOR THIS PURPOSE: IN ORDER TO SHOW YOU MY POWER, ETC. To inform you of your foolishness, in your saying (5:2), "I do not know Adonai.
Sforno
בעבור הראותך את כחי, so that you may finally display repentance. In the final analysis, I am not interested in the death of the sinner but in his rehabilitation through his own efforts. (Ezekiel 18,31)