وَلَقَدْ نَعْلَمُ اَنَّهُمْ یَقُولُونَ اِنَّمَا یُعَلِّمُهُ بَشَرٌؕ لِسَانُ الَّذٖی یُلْحِدُونَ اِلَیْهِ اَعْجَمِیٌّ وَهٰذَا لِسَانٌ عَرَبِیٌّ مُبٖینٌ
And We certainly know that they say, "It is only a human being who teaches the Prophet." The tongue of the one they refer to is foreign, and this Qur'an is [in] a clear Arabic language
Saheeh Intl