Quran 46:13 from Surah Al-Ahqaf on Divine Marvels.
إِنَّ ٱلَّذِينَ قَالُواْ رَبُّنَا ٱللَّهُ ثُمَّ ٱسۡتَقَٰمُواْ فَلَا خَوۡفٌ عَلَيۡهِمۡ وَلَا هُمۡ يَحۡزَنُونَ
English translation: Indeed those who say Our Lord (is) Allah then remain firm then no fear on them and nor they will grieve
Transliteration: inna alladhina qalu rabbuna al-lahu thumma is'taqamu fala khawfun alayhim wala hum yahzanuna