Qur'ān 4:82 · An-Nisa (النساء)

أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ ۚ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَـٰفًۭا كَثِيرًۭا

Then do they not reflect upon the Qur'an? If it had been from [any] other than Allah, they would have found within it much contradiction.