Surah Fussilat, Verse 30:

إِنَّ الَّذِينَ قَالُوا رَبُّنَا اللَّهُ ثُمَّ اسْتَقَامُوا تَتَنَزَّلُ عَلَيْهِمُ الْمَلَائِكَةُ أَلَّا تَخَافُوا وَلَا تَحْزَنُوا وَأَبْشِرُوا بِالْجَنَّةِ الَّتِي كُنتُمْ تُوعَدُون

َ Verily, those who say: "Our Lord is Allah (Alone)," and then they Istaqamu (stand upright) , on them the angels will descend (at the time of their death) (saying): "Fear not, nor grieve!But receive the glad tidings of Paradise which you have been promised