وَلَقَدْ نَعْلَمُ أَنَّهُمْ يَقُولُونَ إِنَّمَا يُعَلِّمُهُ بَشَرٌ لِّسَانُ الَّذِي يُلْحِدُونَ إِلَيْهِ أَعْجَمِيٌّ وَهَذَا لِسَانٌ عَرَبِيٌّ مُّبِينٌ
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سورة النحل
(16/103) And certainly We know that they say: “only a human being teaches him that (the Qur’ân).” The tongue of him to whom they allude is novice (not Arabic) and this (the Qur’ân) is a clear Arabic tongue.
Surah An-Nahl