أَفَغَيْرَ اللّهِ أَبْتَغِي حَكَمًا وَهُوَ الَّذِي أَنَزَلَ إِلَيْكُمُ الْكِتَابَ مُفَصَّلاً وَالَّذِينَ آتَيْنَاهُمُ الْكِتَابَ يَعْلَمُونَ أَنَّهُ مُنَزَّلٌ مِّن رَّبِّكَ بِالْحَقِّ فَلاَ تَكُونَنَّ مِنَ الْمُمْتَرِينَ
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سورة الأنعام
(6/114) Say thou: shall I then seek as judge other than Allah, when it is He who hath sent down toward you the Book detailed? And those whom We vouchsafed the book know that it hath been revealed by thy Lord in truth; so be thou not of the doubters.
Surah Al-An'am