Al-Kāfi - Volume 3 > Recitations in Salah (prayer)
Hadith #9

9ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ يُونُسَ عَنْ عَبْدِ الله بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ يَجُوزُ لِلْمَرِيضِ أَنْ يَقْرَأَ فِي الْفَرِيضَةِ فَاتِحَةَ الْكِتَابِ وَحْدَهَا وَيَجُوزُ لِلصَّحِيحِ فِي قَضَاءِ صَلاَةِ التَّطَوُّعِ بِاللَّيْلِ وَالنَّهَارِ.

9. Afi ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus from ‘Abd Allah ibn Sinan who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘It is permissible for one suffering from illness to recite just al-Fatihah in an obligatory Salah (prayer) as well as for one in good health in Qada’ (compensatory prayer) of optional Salah (prayer) missed during the day or night.’”