Surah Al-An'am (The Cattle), Verse 114

اَفَغَیْرَ اللّٰهِ اَبْتَغِیْ حَكَمًا وَّهُوَ الَّذِیْۤ اَنْزَلَ اِلَیْكُمُ الْكِتٰبَ مُفَصَّلًا وَالَّذِیْنَ اٰتَیْنٰهُمُ الْكِتٰبَ یَعْلَمُوْنَ اَنَّهٗ مُنَزَّلٌ مِّنْ رَّبِّكَ بِالْحَقِّ فَلَا تَكُوْنَنَّ مِنَ الْمُمْتَرِیْنَ ۟

Afaghairal laahi abtaghee hakamanw wa Huwal lazee anzala ilaikumul Kitaaba mufassalaa; wallazeena atai naahumul Kitaaba ya'lamoona annahoo munazzalum mir Rabbika bilhaqqi falaa takoonanna minal mumtareen

“Say: "Shall I seek for judge other than Allah? - when He it is Who hath sent unto you the Book, explained in detail." They know full well, to whom We have given the Book, that it hath been sent down from thy Lord in truth. Never be then of those who doubt.”

Quran 6:114 (Yusuf Ali Translation)