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Surah 6. Al-An'am
Ayah 114 - 115
114أَفَغَيْرَ ٱللَّهِ أَبْتَغِى حَكَمًا وَهُوَ ٱلَّذِىٓ أَنزَلَ إِلَيْكُمُ ٱلْكِتَـٰبَ مُفَصَّلًا ۚ وَٱلَّذِينَ ءَاتَيْنَـٰهُمُ ٱلْكِتَـٰبَ يَعْلَمُونَ أَنَّهُۥ مُنَزَّلٌ مِّن رَّبِّكَ بِٱلْحَقِّ ۖ فَلَا تَكُونَنَّ مِنَ ٱلْمُمْتَرِينَ
115وَتَمَّتْ كَلِمَتُ رَبِّكَ صِدْقًا وَعَدْلًا ۚ لَّا مُبَدِّلَ لِكَلِمَـٰتِهِۦ ۚ وَهُوَ ٱلسَّمِيعُ ٱلْعَلِيمُ
[114-115] This being so, should I seek a judge other than Allah. whereas He has sent down to you the Book with full details?81 And the people whom We gave the Book (before you) know that this Book has been sent down to you with the Truth from your Lord; so you should not be of those who have doubts82 The Word of your Lord is perfect in regard to Truth and justice; there is none who can make any change in His decrees for He hears everything and knows everything.
81The `speaker' in this sentence is the Holy Prophet and the addressees are his followers, who desired that a Sign should be shown for the conversion of the disbelievers. They have been told that no Sign will be shown, for Allah had made all the realities plain in the Qur'an. As regards their conflict with falsehood, He has decreed that the followers of the Truth will have to exert for its domination in the natural way without expecting any supernatural intervention from Him. The Holy Prophet has, therefore, been asked to declare, "Should I, then, seek some authority higher than Allah to revise His decree and to send down such a miracle as should force them to believe?" (Please refer also to E.N. 76).
82That is, "These principles, that have been laid down for the domination of the Truth, are not new ones which might have been invented today to explain away the difficulties and obstacles of the Way. All those people, who possess the knowledge of the Divine Books and are acquainted with the Mission of the Prophets, will bear testimony that whatever is being stated in the Qur'an is the very Truth, which is eternal and has never changed. "