The Holy Quran 26:199 — Surah Ash-Shu'ara

Arabic text

فَقَرَأَهُۥ عَلَيْهِم مَّا كَانُوا۟ بِهِۦ مُؤْمِنِينَ

Translation

...who was to recite it to them (the Arabs), they would have still not believed in it. (The miracle of the Qur'aan would have seemed more profound if a non-Arab had brought it to the Mushrikeen of Makkah because then there would have been no way in which they could have said that he had written it by himself. However, the Mushrikeen of Makkah were so stubborn that even then they would have rejected the Qur'aan).

Tafsir (excerpt) — Tafsir Usmani

Had the Quran been revealed to a non-Arab, they would never have believed: that is, you ﷺ are one of the most eloquent of the Arabs. The idolaters of Makkah might say, “He must have composed the Quran himself” (although the Quran has reached such a degree of inimitability that all the jinn and mankind together cannot produce its like)

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