Surah Al-An'am, Verse 114

أَفَغَيۡرَ ٱللَّهِ أَبۡتَغِي حَكَمٗا وَهُوَ ٱلَّذِيٓ أَنزَلَ إِلَيۡكُمُ ٱلۡكِتَٰبَ مُفَصَّلٗاۚ وَٱلَّذِينَ ءَاتَيۡنَٰهُمُ ٱلۡكِتَٰبَ يَعۡلَمُونَ أَنَّهُۥ مُنَزَّلٞ مِّن رَّبِّكَ بِٱلۡحَقِّۖ فَلَا تَكُونَنَّ مِنَ ٱلۡمُمۡتَرِينَ١١٤

afaghayra l-lahi abtaghī ḥakaman wahuwa alladhī anzala ilaykumu l-kitāba mufaṣṣalan wa-alladhīna ātaynāhumu l-kitāba yaʿlamūna annahu munazzalun min rabbika bil-ḥaqi falā takūnanna mina l-mum'tarīna

[Say], "Then is it other than Allāh I should seek as judge while it is He who has revealed to you the Book [i.e., the Qur’ān] explained in detail?" And those to whom We [previously] gave the Scripture know that it is sent down from your Lord in truth, so never be among the doubters.