وَ فِي رِوَايَةِ اِبْنِ بُكَيْرٍ: أَنَّهُ سُئِلَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ عَنْ قَوْلِ اَللَّهِ عَزَّ وَ جَلَّ « وَ عَلَى اَلَّذِينَ يُطِيقُونَهُ فِدْيَةٌ طَعٰامُ مِسْكِينٍ » قَالَ «عَلَى اَلَّذِينَ كَانُوا يُطِيقُونَ اَلصَّوْمَ ثُمَّ أَصَابَهُمْ كِبَرٌ أَوْ عُطَاشٌ أَوْ شِبْهُ ذَلِكَ فَعَلَيْهِمْ لِكُلِّ يَوْمٍ مُدٌّ».
In the narration of Ibn Bukayr, it is reported that Imam Jafar ibn Muhammad Al-Sadiq (a.s) was asked about the verse of Allah (swt), the Exalted: "And upon those who can fast with difficulty, there is a ransom: the feeding of a poor person" (Surah Al-Baqarah 2:184). Imam (a.s) said: "[This applies] to those who were able to fast but then became elderly, suffered from chronic thirst, or similar conditions. They must give a mudd (a specific measure) of food for each day."