﴿ أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ ۚ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَٰفًۭا كَثِيرًۭا ﴾

“Will they not, then, try to understand this Qur’an? Had it issued from any but God, they would surely have found in it many an inner contradiction!”

(Will they not then ponder on the Qur'an?) do they not reflect on the Qur'an that its different parts are harmonious and support each other and it further contains that which the Prophet (pbuh) commands them? (If it had been from other than Allah) if this Qur'an had come from anyone other than Allah (they would have found therein much incongruity) much contradictions whereby its different parts are not harmonious.