וְהָיְתָ֤ה אֶֽרֶץ־מִצְרַ֙יִם֙ לִשְׁמָמָ֣ה וְחָרְבָּ֔ה וְיָדְע֖וּ כִּֽי־אֲנִ֣י יְהוָ֑ה יַ֧עַן אָמַ֛ר יְאֹ֥ר לִ֖י וַאֲנִ֥י עָשִֽׂיתִי׃
埃及地必荒涼，成為廢墟；他們就必知道我是永恆者。因為他曾說：『這河是我的，是我自己造的。』
Midrash Tanchuma Buber
Pharaoh made himself into a deity, as stated (in Ezek. 29:9): BECAUSE HE SAID: {MY} [THE] NILE IS MINE AND I MADE {MYSELF} [IT]. He said: I am the one who created myself. Immediately <the Holy One> made known to him that he was flesh and blood. The Holy One said <to Moses >: Because he has made himself into a deity, inform him that he is flesh and blood. See, he is setting out on the way to his morning toilet. Grab him and inform him that he is flesh and blood. What did Moses do? Immediately, as soon as the Holy One told him to go to Pharaoh early in the morning, Moses grabbed him. He said: Leave me alone to make my toilet, and after that I shall speak with you. Moses said to him: Is there a deity who makes his toilet? Therefore, the Holy One said to him (in Exod. 9:13): GO EARLY IN THE MORNING, and inform him that he is flesh and blood.