Surah An nur (the Light) 24 : 21 Had it not been for the grace of Allah and His mercy unto you, not one of you would ever have grown pure

24:21

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Sahih International

O you who have believed, do not follow the footsteps of Satan. And whoever follows the footsteps of Satan - indeed, he enjoins immorality and wrongdoing. And if not for the favor of Allah upon you and His mercy, not one of you would have been pure, ever, but Allah purifies whom He wills, and Allah is Hearing and Knowing.

source

http://quran.com/24

Surah Al-Noor

O ye who believe! Follow not the footsteps of the devil. Unto whomsoever followeth the footsteps of the devil, lo! he commandeth filthiness and wrong. Had it not been for the grace of Allah and His mercy unto you, not one of you would ever have grown pure. But Allah causeth whom He will to grow. And Allah is Hearer, Knower. (21)  

source

http://www.quranexplorer.com/quran/