اَفَغَيْرَ اللّٰهِ اَبْتَغِيْ حَكَمًا وَّهُوَ الَّذِيْٓ اَنْزَلَ اِلَيْكُمُ الْكِتٰبَ مُفَصَّلًا ۗوَالَّذِيْنَ اٰتَيْنٰهُمُ الْكِتٰبَ يَعْلَمُوْنَ اَنَّهٗ مُنَزَّلٌ مِّنْ رَّبِّكَ بِالْحَقِّ فَلَا تَكُوْنَنَّ مِنَ الْمُمْتَرِيْنَ ( الأنعام: ١١٤ )
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 (al-ʾAnʿām 6:114)
Sahih International:
[Say], "Then is it other than Allah I should seek as judge while it is He who has revealed to you the Book [i.e., the Quran] 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. (Al-An'am [6] : 114)
1 Mufti Taqi Usmani
So, should I seek someone other than Allah as judge, while it is He who has sent down to you the Book in details? Those We have given the Book know that it is revealed from your Lord with the truth. So, never be one of those who are in suspicion.