الرَّعْدِ · 37

وَكَذَٰلِكَ أَنزَلۡنَٰهُ حُكۡمًا عَرَبِيࣰّ اۚ وَلَئِنِ ٱتَّبَعۡتَ أَهۡوَآءَهُم بَعۡدَ مَا جَآءَكَ مِنَ ٱلۡعِلۡمِ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِيࣲّ وَلَا وَاقࣲ‏

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