Hadith on Purification: Prayer can remove sin

Abu Huraira narrated: The Messenger of Allah, peace be upon him, said: “The five prayers, and Friday to Friday, wipe out sins between them, so long as major sins are avoided.”
[Sahih Muslim, Book 2, Number 448]

 عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ الصَّلاَةُ الْخَمْسُ وَالْجُمُعَةُ إِلَى الْجُمُعَةِ كَفَّارَةٌ لِمَا بَيْنَهُنَّ مَا لَمْ تُغْشَ الْكَبَائِرُ