Seeking Forgiveness for Mortal Sin

O Mohammad, tell whoever has committed a major sin from your nation and wants to erase it and purify himself from it, to cleanse his body and clothes for me. Then he should go out to the wilderness of my land and face my countenance, meaning the Qibla, where no one could see him. Then he should raise his hands to me, for there is no barrier between me and him, and he should say:

يَا وَاسِعاً بِحُسْنِ عَائِدَتِهِ وَ يَا مُلَبِّسَنَا فَضْلَ رَحْمَتِهِ وَ يَا مَهِيباً لِشِدَّةِ سُلْطَانِهِ وَ يَا رَاحِماً بِكُلِّ مَكَان ضَرِيراً أَصَابَهُ الضُّرُّ فَخَرَجَ إِلَيْكَ مُسْتَغِيثاً بِكَ آئِباً إِلَيْكَ هَائِباً لَكَ يَقُولُ عَمِلْتُ سُوءاً وَ ظَلَمْتُ نَفْسِي وَ لِمَغْفِرَتِكَ خَرَجْتُ إِلَيْكَ أَسْتَجِيرُ بِكَ فِي خُرُوجِي مِنَ النَّارِ وَ بِعِزِّ جَلاَلِكَ تَجَاوَزْتُ، تَجَاوَزْ يَا كَرِيمُ وَ بِاسْمِكَ الَّذِي تَسَمَّيْتَ بِهِ وَ جَعَلْتَهُ فِي كُلِّ عَظَمَتِكَ وَ مَعَ كُلِّ قُدْرَتِكَ وَ فِي كُلِّ سُلْطَانِكَ وَ صَيَّرْتَهُ فِي قَبْضَتِكَ وَ نَوَّرْتَهُ بِكِتَابِكَ وَ أَلْبَسْتَهُ وَقَاراً مِنْكَ، يَا اللهُ يَا اللهُ أَطْلُبُ إِلَيْكَ أَنْ تُصَلِّيَ عَلَى مُحَمَّد وَ آلِ مُحَمَّد وَ أَنْ تَمْحُوَ عَنِّي مَا أَتَيْتُكَ بِهِ وَانْزِعْ بَدَنِي عَنْ مِثْلِهِ، فَإِنِّي بِكَ لاَ إِلَهَ إِلاَّ أَنْتَ أَعْتَصِمُ وَ بِاسْمِكَ الَّذِي فِيهِ تَفْصِيلُ الْاُمُورِ كُلِّهَا مُؤْمِنٌ هَذَا اعْتِرَافِي لَكَ، فَلاَ تَخْذُلْنِي وَهَبْ لِي عَافِيَةً وَ أَنْجِنِي مِنَ الذَّنْبِ الْعَظِيمِ، هَلَكْتُ فَتَلاَفَنِي بِحَقِّ حُقُوقِكَ كُلِّهَا يَا كَرِيمُ. 

O Vast in the exquisiteness of His profit, O Enrober of us in the grace of His mercy, O Majestic in the intensity of His sovereignty, O Merciful, in every place, of a blind person whom harm has befallen, so he comes out to You seeking help from You, returning to You, fearing You, saying: I have done wrong and wronged myself, and for Your forgiveness I have come out to you seeking refuge with you in my exit from the fire, and by the dignity of Your majesty, I have surpassed, forgive [me], O Munificent one, and in Your name which You have named and made in all Your greatness and with all Your power and in all Your sovereignty, and you made it in Your grasp, and you illuminated it with Your book, and you clothed it with dignity from You. O Allah, O Allah, I ask You to bless upon Mohammad and the family of Mohammad, and to erase from me what I have come to You with, and remove my body from its like, for indeed with You, there is no god but You, I hold fast, and in Your name in which the details of all matters are, I am believer. This is my confession to You, so do not forsake me, and grant me well-being, and deliver me from the mortal sin, I am perished, so save me by the right of all Your rights, O Generous one.

If he does not intend anyone, by what I have commanded you, other than Me, I absolve him of his major sin until I forgive it for him and purify him perpetually from it, because I have taught you names by which I answer the supplicant.

Bihar Al-Anwar (ed. - Beirut), vol. 92, p. 307