Imam al-Sadiq (AS) said, 'Verily Allah, Exalted be His Remembrance, has angels who strip off sins from the backs of our followers (shiaa) like the wind strips the leaves off the trees in autumn, and this is in accordance with His words in the Qur'an, "they glorify the praise of their Lord and seek forgiveness on behalf of those who believe.” By Allah this verse refers to none other than you [my followers].