The Rules of Forgetfulness (Sahw) in Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 50
وَ رَوَى أَبُو حَمْزَةَ اَلثُّمَالِيُّ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «أَتَى اَلنَّبِيَّ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ رَجُلٌ فَقَالَ يَا رَسُولَ اَللَّهِ لَقِيتُ مِنْ وَسْوَسَةِ صَدْرِي شِدَّةً وَ أَنَا رَجُلٌ مُعِيلٌ مَدِينٌ مُحْوِجٌ فَقَالَ لَهُ «كَرِّرْ هَذِهِ اَلْكَلِمَاتِ: تَوَكَّلْتُ «عَلَى اَلْحَيِّ اَلَّذِي لاٰ يَمُوتُ» وَ «اَلْحَمْدُ لِلّٰهِ اَلَّذِي لَمْ يَتَّخِذْ» صَاحِبَةً وَ لاَ «وَلَداً وَ لَمْ يَكُنْ لَهُ شَرِيكٌ فِي اَلْمُلْكِ وَ لَمْ يَكُنْ لَهُ وَلِيٌّ مِنَ اَلذُّلِّ وَ كَبِّرْهُ تَكْبِيراً» » قَالَ فَلَمْ يَلْبَثِ اَلرَّجُلُ أَنْ عَادَ إِلَيْهِ فَقَالَ يَا رَسُولَ اَللَّهِ أَذْهَبَ اَللَّهُ عَنِّي وَسْوَسَةَ صَدْرِي وَ قَضَى دَيْنِي وَ وَسَّعَ رِزْقِي.
Abu Hamzah al-Thumali narrated from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام that He said: "A man came to the Prophet صلى الله عليه وعلى آله وسلم and said: 'O’ Messenger of Allah صلى الله عليه وعلى آله وسلم, I am experiencing great distress due to the whispers in my chest, and I am a man who is a caretaker, in debt, and in need.' The Prophet صلى الله عليه وعلى آله وسلم said to him: 'Repeat these words: "I place my trust in the Ever-Living, Who does not die," and "Praise be to Allah سبحانه وتعالى, Who did not take a wife or a son, and Who has no partner in His kingdom, nor a helper in His humiliation," and magnify Him with great magnification.' The man said that shortly afterward, he returned to the Prophet صلى الله عليه وعلى آله وسلم and said: 'O’ Messenger of Allah صلى الله عليه وعلى آله وسلم, Allah سبحانه وتعالى has removed the whispers from my chest, settled my debt, and expanded my sustenance.'"
- Ṣaḥīḥ al-Faqīh