عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَفَّارَةُ الذَّنْبِ النَّدَامَةُ وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ لَوْ لَمْ تُذْنِبُوا لَجَاءَ اللَّهُ عَزَّ وَجَلَّ بِقَوْمٍ يُذْنِبُونَ لِيَغْفِرَ لَهُمْ
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: The expiation for sin is remorse. Also, he (peace and blessings be upon him) said: If you do not commit sins, Allah Almighty will bring a people who will commit sins and Allah Almighty will forgive them.