Sura al-Anʿām 6:114

أَفَغَيْرَ ٱللَّـهِ أَبْتَغِى حَكَمًا وَهُوَ ٱلَّذِىٓ أَنزَلَ إِلَيْكُمُ ٱلْكِتَٰبَ مُفَصَّلًا وَٱلَّذِينَ ءَاتَيْنَٰهُمُ ٱلْكِتَٰبَ يَعْلَمُونَ أَنَّهُۥ مُنَزَّلٌ مِّن رَّبِّكَ بِٱلْحَقِّ فَلَا تَكُونَنَّ مِنَ ٱلْمُمْتَرِينَ

a-fa-ghayra allāhi abtaghī ḥakaman wa-huwa alladhī anzala ilaykumu l-kitāba mufaṣṣalan wa-lladhīna ātaynāhumu l-kitāba yaʿlamūna annahu munazzalun min rabbika bil-ḥaqqi fa-lā takūnanna mina l-mumtarīna

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.