Quran 6:51 from Surah Al-An'aam on Divine Marvels.
وَأَنذِرۡ بِهِ ٱلَّذِينَ يَخَافُونَ أَن يُحۡشَرُوٓاْ إِلَىٰ رَبِّهِمۡ لَيۡسَ لَهُم مِّن دُونِهِۦ وَلِيّٞ وَلَا شَفِيعٞ لَّعَلَّهُمۡ يَتَّقُونَ
English translation: And warn with it those who fear that they will be gathered to their Lord not for them of other than Him any protector and not any intercessor so that they may (become) righteous
Transliteration: wa-andhir bihi alladhina yakhafuna an yuh'sharu ila rabbihim laysa lahum min dunihi waliyyun wala shafi'un la'allahum yattaquna