וְיָדְע֥וּ מִצְרַ֖יִם כִּי־אֲנִ֣י יְהוָ֑ה בְּהִכָּבְדִ֣י בְּפַרְעֹ֔ה בְּרִכְבּ֖וֹ וּבְפָרָשָֽׁיו׃
At malalaman ng mga taga-Egipto na ako ang Walang-Hanggan, kapag ako'y naparangalan na sa pamamagitan ni Faraon, ng kanyang mga karwahe at ng kanyang mga mangangabayo.”
Sforno
וידעו מצרים, the Egyptians who had remained at home, mostly the women and children and the aged, and they would practice penitence, seeing G’d is not interested in the sinner’s death but in his rehabilitation.
Malbim
The Egyptians will know. Only then will they know because after B’nei Yisrael departed the Egyptians retracted from their initial acknowledgement and denied that it was Hashem who performed all the wonders they experienced.
Rav Hirsch
V. 18. Diese Offenbarung der ganzen Wucht meiner Macht soll ein belehrendes und warnendes Exempel für die ägyptische Welt werden und für alle, die Pharao gleich in militärische Gewalt, mit Außerachtlassung alles sittlichen Momentes, die Größe und das Heil und den Sieg der Völker setzen. —