Surah Ar-Ra'd (The Thunder), Verse 37

وَكَذٰلِكَ اَنْزَلْنٰهُ حُكْمًا عَرَبِیًّا وَلَىِٕنِ اتَّبَعْتَ اَهْوَآءَهُمْ بَعْدَ مَا جَآءَكَ مِنَ الْعِلْمِ مَا لَكَ مِنَ اللّٰهِ مِنْ وَّلِیٍّ وَّلَا وَاقٍ 

Wa kazaalika anzalnaahu hukman 'Arabiyyaa; wa la'init taba'ta ahwaaa 'ahum ba'da maa jaaa'aka minal 'ilmi maa laka minal laahi minw waliyinw wa laa waaq

“Thus have We revealed it to be a judgment of authority in Arabic. Wert thou to follow their (vain) desires after the knowledge which hath reached thee, then wouldst thou find neither protector nor defender against Allah.”

Quran 13:37 (Yusuf Ali Translation)