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Surah 4. An-Nisaa'
Ayah 81 - 82
81وَيَقُولُونَ طَاعَةٌ فَإِذَا بَرَزُوا۟ مِنْ عِندِكَ بَيَّتَ طَآئِفَةٌ مِّنْهُمْ غَيْرَ ٱلَّذِى تَقُولُ ۖ وَٱللَّهُ يَكْتُبُ مَا يُبَيِّتُونَ ۖ فَأَعْرِضْ عَنْهُمْ وَتَوَكَّلْ عَلَى ٱللَّهِ ۚ وَكَفَىٰ بِٱللَّهِ وَكِيلًا
82أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ ۚ وَلَوْ كَانَ مِنْ عِندِ غَيْرِ ٱللَّهِ لَوَجَدُوا۟ فِيهِ ٱخْتِلَـٰفًا كَثِيرًا
[81-82] In your presence, they say, "We are obedient to you," but when they leave you, some of them meet together secretly at night to plot against what you say; Allah writes down all their secret talks; so leave them alone and trust in Allah; Allah alone suffices for trust. Do they not ponder over the Qur'an? Had it been from any other than Allah, surely there would have been many contradictions in it.111
111The main cause of the wrong attitude of the hypocrites and the people of weak faith, who had been warned in the foregoing verses, was that they had doubts that the Qur'an was from Allah. They could not believe that it was being sent down by Allah to the Holy Prophet and that the Commandments contained in it were directly coming from Him. That is why they are being admonished to consider the Qur'an by giving close attention to it, and to verify whether their doubts are genuine and whether it is from Allah or not. The Qur'an itself bears witness to the truth that it is from none other than Allah, for none else, however wise and intelligent he might be, could have gone on delivering addresses under different circumstances about variant topics so as to form a connected, balanced and coherent Book at the end of twenty-three years and that too, without showing any contradiction whatever from the beginning to the end, and without there arising any need to revise or make any change in it.