16:103
وَلَقَدْ نَعْلَمُ اَنَّهُمْ یَقُولُونَ اِنَّمَا یُعَلِّمُهُ بَشَرٌؕ لِسَانُ الَّذٖی یُلْحِدُونَ اِلَیْهِ اَعْجَمِیٌّ وَهٰذَا لِسَانٌ عَرَبِیٌّ مُبٖینٌ
Walaqad naAAlamu annahum yaqooloona innama yuAAallimuhu basharun lisanu allathee yulhidoona ilayhi aAAjamiyyun wahatha lisanun AAarabiyyun mubeenun
Translations
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 International
And We know well that they say: Only a man teacheth him. The speech of him at whom they falsely hint is outlandish, and this is clear Arabic speech
Marmaduke Pickthall