Sura 39 Az-Zumar (The Troops), ayah 54

1. وَأَنِيبُوا إِلَىٰ رَبِّكُمْ وَأَسْلِمُوا لَهُ مِنْ قَبْلِ أَنْ يَأْتِيَكُمُ الْعَذَابُ ثُمَّ لَا تُنْصَرُونَ

   And return (in repentance) to your Lord and submit to Him before the punishment comes upon you; then you will not be helped.

   39:54

Translation: Saheeh International