וַיָּ֧שָׁב מֹשֶׁ֛ה אֶל־יְהוָ֖ה וַיֹּאמַ֑ר אֲדֹנָ֗י לָמָ֤ה הֲרֵעֹ֙תָה֙ לָעָ֣ם הַזֶּ֔ה לָ֥מָּה זֶּ֖ה שְׁלַחְתָּֽנִי׃
I zwrócił się Mojżesz do Wiekuistego i rzekł: "Panie! czemuś to zło wyrządził ludowi temu, czemu posłałeś mnie?
Rashi
למה הרעתה לעם הזה WHEREFORE HAST THOU DONE SO EVIL TO THIS PEOPLE? — And if You ask, “What concern is that of yours?” I answer “I have to complain that You have sent me at all” (Exodus Rabbah 5:22).
Chizkuni
וישב משה אל ה, “Moses returned to Hashem;” to the site from which He had spoken to him last. (Rash’bam)
Ramban
ADO-NOY’, WHEREFORE HAST THOU DEALT ILL WITH THIS PEOPLE? The Divine Name is here written Aleph Dalet, for through the Proper Name of G-d, [i.e., the Tetragrammaton], which is the attribute of mercy, no evil would befall the people. However, above [in Chapter 4, Verses 10 and 13], Moses twice mentioned the Divine Name written Aleph Dalet — [Bi Ado-noy (O G-d)] — since he was praying that the anger of G-d would not be kindled against him [for refusing to undertake the mission to go to Pharaoh]. Perhaps Moses was afraid to mention the Great Divine Name that was then being revealed to him and speaking to him.