SHAFAQNA – Imam Ali (AS) said: Then, take heed from what God did to Satan who for a moment of being arrogant, his long-time deeds were wiped off, and all of his efforts became useless. Satan worshipped God for 6000 years, so who is safe (from sins) after Satan ? In another narration, Imam Ali (AS) described a prayer in which he taught everyone how to beg forgiveness for sins from God: O’ Allah (SWT), I beg forgiveness from You for all sins which destroy good deeds, and add to ugliness, and hasten calamities, and make You angry. Therefore, Send greetings to the Prophet Mohammad (PBUH) and his family and forgive me for those sins; O’ the best Merciful .
 Nahjul Balaghah, Sermon 192.
 Al-Baladul Amin, Page 43.