Quran 39:55 — The Throngs (Al-Zumar)

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.

[39:54] You shall obey your Lord, and submit to Him totally, before the retribution overtakes you, then you cannot be helped.

[39:56] Lest a soul may say, "How sorry I am for disregarding GOD's commandments; I was certainly one of the mockers."