Man Lā Yaḥḍuruh al-Faqīh
Hadith 3801951 - وَ سَأَلَ عَبْدُ اَلْمَلِكِ بْنُ عُتْبَةَ اَلْهَاشِمِيُّ أَبَا اَلْحَسَنِ عَلَيْهِ اَلسَّلاَمُ : عَنِ اَلشَّيْخِ اَلْكَبِيرِ وَ اَلْعَجُوزِ اَلْكَبِيرَةِ اَلَّتِي تَضْعُفُ عَنِ اَلصَّوْمِ فِي شَهْرِ رَمَضَانَ قَالَ «يَتَصَدَّقُ عَنْ كُلِّ يَوْمٍ بِمُدٍّ مِنْ حِنْطَةٍ».
Hadith.1951 - Abd al-Malik ibn Utbah al-Hashimi asked Abu al-Hasan (as) about an elderly man and an elderly woman who are too weak to fast during the Month of Ramadan.
Imam (as) said: "They should give a mudd (a specific measure) of wheat as charity for each day."