Expiation of Evil Deeds
وَ عَنِ النَّبِيِّ ص عَلَيْكُمْ بِقِيَامِ اللَّيْلِ فَإِنَّهُ دَأْبُ الصَّالِحِينَ قَبْلَكُمْ وَ إِنَّ قِيَامَ اللَّيْلِ قُرْبَةٌ إِلَى اللَّهِ وَ تَكْفِيرُ السَّيِّئَاتِ وَ مَنْهَاةٌ عَنِ الْإِثْمِ وَ مَطْرَدَةُ الدَّاءِ عَنِ الْجَسَدِ
And from the Prophet-saww: ‘Upon you all with standing (for Salat) at night, for it is a discipline of the righteous ones before you and standing at night (for Salat) draws near to Allah-azwj and ‘تَكْفِيرُ السَّيِّئَاتِ ’ expiates the evil deeds, and a deterrent from the sins, and repellent of the illnesses from the body’.[1]
[1] Bihar Al-Anwaar – V-59 The book of creation – Ch 88 H 49