Surah Al-Mai'dah (The Spread Table), Verse 49

وَاَنِ احْكُمْ بَیْنَهُمْ بِمَاۤ اَنْزَلَ اللّٰهُ وَلَا تَتَّبِعْ اَهْوَآءَهُمْ وَاحْذَرْهُمْ اَنْ یَّفْتِنُوْكَ عَنْ بَعْضِ مَاۤ اَنْزَلَ اللّٰهُ اِلَیْكَ فَاِنْ تَوَلَّوْا فَاعْلَمْ اَنَّمَا یُرِیْدُ اللّٰهُ اَنْ یُّصِیْبَهُمْ بِبَعْضِ ذُنُوْبِهِمْ وَاِنَّ كَثِیْرًا مِّنَ النَّاسِ لَفٰسِقُوْنَ ۟

Wa anih kum bainahum bimaaa anzalal laahu wa laa tattabi' ahwaaa'ahum wahzarhum ai yaftinooka 'am ba'di maaa anzalal laahu ilaika fa in tawallaw fa'lam annamaa yureedul laahu ai yuseebahum biba'di zunoobihim; wa inna kaseeram minan naasi lafaasiqoon

“And this (He commands): Judge thou between them by what Allah hath revealed, and follow not their vain desires, but beware of them lest they beguile thee from any of that (teaching) which Allah hath sent down to thee. And if they turn away, be assured that for some of their crime it is Allah's purpose to punish them. And truly most men are rebellious.”

Quran 5:49 (Yusuf Ali Translation)