An-Naĥl 16:103 · سُورَةُ النحل

وَلَقَدْ نَعْلَمُ أَنَّهُمْ يَقُولُونَ إِنَّمَا يُعَلِّمُهُۥ بَشَرٌ ۗ لِّسَانُ ٱلَّذِى يُلْحِدُونَ إِلَيْهِ أَعْجَمِىٌّ وَهَـٰذَا لِسَانٌ عَرَبِىٌّ مُّبِينٌ

walaqad naʿlamu annahum yaqūlūna innamā yuʿallimuhu basharun lisānu alladhī yul'ḥidūna ilayhi aʿjamiyyun wahādhā lisānun ʿarabiyyun mubīnun

And We certainly know that they say, "It is only a human being who teaches him [i.e., the Prophet (ﷺ)]." The tongue of the one they refer to is foreign, and this [recitation, i.e., Qur’ān] is [in] a clear Arabic language.

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