Al-Kāfi - The Book of Fasting

Chapter: The Case of Seniors Who Feel Weak when Fasting َّدٍ عَنِ ابْنِ فَضَّالٍ عَنِ ابْنِ بُكَيْرٍ عَنْ بَعْضِ أَصْحَابِنَا عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَ٠) فِي قَوْلِ الله عَزَّ وَجَلَّ وَعَلَى الَّذِينَ يُطِيقُونَهُ فِدْيَةٌ طَعا٠ِسْكِينٍ قَالَ الَّذِينَ كَانُوا يُطِيقُونَ الصَّوْ٠ْ كِبَرٌ أَوْ عُطَاشٌ أَوْ شِبْهُ ذَلِكَ فَعَلَيْهِ٠5.

Ahmad ibn Muhammad from has narrated from ibn Faddal from ibn Bukayr from certain persons of our people who have said the following: “This is about the words of Allah, most Majestic, most Glorious, ‘Those who cannot afford, feed sixty destitute persons.’ Abu ‘Abd Allah (a.s.), has said, ‘Those who were able to fast but now because of old age or thirst and so on (cannot fast), must pay one mud of food for every day of fast.’”