Rules about Salah (Prayer) of Fainted or Persons
Al-Kāfi|Volume 3|Book 4|Chapter 65
5ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادٍ عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ قُلْتُ لَهُ رَجُلٌ مَرِضَ فَتَرَكَ النَّافِلَةَ فَقَالَ يَا مُحَمَّدُ لَيْسَتْ بِفَرِيضَةٍ إِنْ قَضَاهَا فَهُوَ خَيْرٌ يَفْعَلُهُ وَإِنْ لَمْ يَفْعَلْ فَلاَ شَيْءَ عَلَيْهِ.
5. Ali ibn Ibrahim has narrated from his father from Hammad, from Hariz from Muhammad ibn Muslim who has said the following: “I once said to him (the Imam) عليه السلام, ‘There is a man who has become ill and has omitted optional Salah (prayer).’ He (the Imam) said, ‘O Muhammad, it is not obligatory Salah (prayer). If he performs, it is a good deed that he does. If he did not do, he is not required to perform it.’”
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (5/338)
- Ṣaḥīḥ al-Kāfī, vol. 1, p. 319