Suuratul An-Nisaa, Verse 82.
أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ ۚ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّـهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَـٰفًا كَثِيرًا ﴿٨٢
82. Do they not then consider the Qur’an carefully? Had it been from other than Allah, they would surely have found therein much contradictions.
PS: Though, this verse does not mention the word “aayah” explicitly, it still points us to the sign and miracle of the Quran.
AnAayahAtATime 