Quran 39:54 — The Throngs (Al-Zumar)

وَأَنيبوا إِلىٰ رَبِّكُم وَأَسلِموا لَهُ مِن قَبلِ أَن يَأتِيَكُمُ العَذابُ ثُمَّ لا تُنصَرونَ

You shall obey your Lord, and submit to Him totally, before the retribution overtakes you, then you cannot be helped.

[39:53] Proclaim: "O My servants who exceeded the limits, never despair of GOD's mercy. For GOD forgives all sins. He is the Forgiver, Most Merciful."

[39:55] And follow the best path that is pointed out for you by your Lord, before the retribution overtakes you suddenly when you least expect it.