أَفَلاَ يَتَدَبَّرُونَ الْقُرْآنَ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ اللّهِ لَوَجَدُواْ فِيهِ اخْتِلاَفًا كَثِيرًا
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سورة النساء
(4/82) Do they not then ponder on the Qur’an? If it had been from other than Allah they would have found in it many contradictions.
Surah An-Nisa