﴿ بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ لَمْ يَكُنِ ٱلَّذِينَ كَفَرُوا۟ مِنْ أَهْلِ ٱلْكِتَٰبِ وَٱلْمُشْرِكِينَ مُنفَكِّينَ حَتَّىٰ تَأْتِيَهُمُ ٱلْبَيِّنَةُ ﴾

“IT IS NOT [conceivable] that such as are bent on denying the truth - [be they] from among the followers of earlier revelation or from among those who ascribe divinity to aught beside God should ever be abandoned [by Him] ere there comes unto them the [full] evidence of the truth:”

The Arab pagans and the followers of Divine scriptures (i.e. followers of previous prophets) used to ask the Prophet Muhammad to show them some miracles, as clear evidence, or demanded that an angel should descend from heaven and talk to them. Only then would they accept his prophethood. But those who make such demands are inevitably frivolous. Such demands had already been made by their forebears, but in spite of their demands being conceded to, they could not become believers.