Quran chapter 91 surah 91.

The forgiveness of sin.

God swears by what He created 8 times and swears by His name 4 times meaning God swears 12 times that the person who cleans his soul (of wrong doing through repentance and returning to good behaviour) will succeed in the hereafter and the person who corrupts his soul (by both not repenting and not returning to good behaviour) will fail in the hereafter (Quran 91:1 – 91:10).