The Holy Quran 6:109 — Surah Al-An'am
Arabic text
وَأَقْسَمُوا۟ بِٱللَّهِ جَهْدَ أَيْمَـٰنِهِمْ لَئِن جَآءَتْهُمْ ءَايَةٌ لَّيُؤْمِنُنَّ بِهَا ۚ قُلْ إِنَّمَا ٱلْـَٔايَـٰتُ عِندَ ٱللَّهِ ۖ وَمَا يُشْعِرُكُمْ أَنَّهَآ إِذَا جَآءَتْ لَا يُؤْمِنُونَ
Translation
They (the Kuffaar of Makkah) swear earnest oaths by Allaah that if an Aayah (a miracle that they desire, like turning Mount Safa into gold) comes to them from Allaah, they will definitely accept Imaan. Say, "Aayaat (miracles) are only with Allaah (a Nabi can only display a miracle when Allaah wills)." How do you know (O Rasulullaah, how can you be sure) if they will accept Imaan when an Aayah (miracle) comes to them? (Only Allaah knows whether they will accept Islaam by witnessing a miracle. It is therefore only He Who can decide whether they should be shown a miracle or not.)
Tafsir (excerpt) — Tafsir Usmani
That is, certain signs they demanded, for example, that Mount Safa turn into pure gold. The demand for miracles to order, and the answer to it: some Muslims thought it would be good if this demand of theirs, too, were fulfilled [so that they would be left without excuse]. To this it was said: what do you know?
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