Quran 41:30 from Surah Fussilat on Divine Marvels.
إِنَّ ٱلَّذِينَ قَالُواْ رَبُّنَا ٱللَّهُ ثُمَّ ٱسۡتَقَٰمُواْ تَتَنَزَّلُ عَلَيۡهِمُ ٱلۡمَلَٰٓئِكَةُ أَلَّا تَخَافُواْ وَلَا تَحۡزَنُواْ وَأَبۡشِرُواْ بِٱلۡجَنَّةِ ٱلَّتِي كُنتُمۡ تُوعَدُونَ
English translation: Indeed those who say Our Lord (is) Allah then stand firm will descend on them the Angels Do not fear and (do) not grieve but receive the glad tidings of Paradise which you were promised
Transliteration: inna alladhina qalu rabbuna al-lahu thumma is'taqamu tatanazzalu alayhimu al-malaikatu alla takhafu wala tahzanu wa-abshiru bil-janati allati kuntum tu'aduna