אָמַ֜רְתִּי אַךְ־תִּירְאִ֤י אוֹתִי֙ תִּקְחִ֣י מוּסָ֔ר וְלֹֽא־יִכָּרֵ֣ת מְעוֹנָ֔הּ כֹּ֥ל אֲשֶׁר־פָּקַ֖דְתִּי עָלֶ֑יהָ אָכֵן֙ הִשְׁכִּ֣ימוּ הִשְׁחִ֔יתוּ כֹּ֖ל עֲלִילוֹתָֽם׃
我曾說：«你只要敬畏我，領受管教，她的住處就不會被剪除，我為她所命定的一切也不會斷絕。»然而他們卻早早起來，敗壞了自己一切的作為。
Rashi
ואני אקשה AND I WILL ALLOW [PHARAOH’S HEART] TO HARDEN — Since he has wickedly resisted Me, and it is manifest to Me that the heathen nations find no spiritual satisfaction in setting their whole heart to return to Me penitently, it is better that his heart should be hardened in order that My signs may be multiplied against him so that ye may recognise My divine power. Such, indeed, is the method of the Holy One, blessed be He: He brings punishment upon the nations so that Israel may hear of it and fear Him, as it is said, (Zephaniah 3:6, 3:7) “I have cut off nations, their corners are desolate etc. … I said: Surely thou wilt fear Me, thou wilt receive correction” (cf. Yevamot 63a). Nevertheless, in the case of the first five plagues it is not stated, “The Lord hardened Pharaoh’s heart” but “Pharaoh’s heart was hardened” (Midrash Tanchuma, Vaera 3).