Chapter on Zakat Al-Fitrah
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 37
وَ رَوَى مُحَمَّدُ بْنُ أَحْمَدَ بْنِ يَحْيَى عَنْ جَعْفَرِ بْنِ إِبْرَاهِيمَ بْنِ مُحَمَّدٍ اَلْهَمَذَانِيِّ وَ كَانَ مَعَنَا حَاجّاً قَالَ: كَتَبْتُ إِلَى أَبِي اَلْحَسَنِ عَلَيْهِ اَلسَّلاَمُ عَلَى يَدِ أَبِي جُعِلْتُ فِدَاكَ أَنَّ أَصْحَابَنَا اِخْتَلَفُوا فِي اَلصَّاعِ بَعْضُهُمْ يَقُولُ اَلْفِطْرَةُ بِصَاعِ اَلْمَدَنِيِّ وَ بَعْضُهُمْ يَقُولُ بِصَاعِ اَلْعِرَاقِيِّ فَكَتَبَ عَلَيْهِ اَلسَّلاَمُ إِلَيَّ «اَلصَّاعُ سِتَّةُ أَرْطَالٍ بِالْمَدَنِيِّ وَ تِسْعَةُ أَرْطَالٍ بِالْعِرَاقِيِّ» قَالَ وَ أَخْبَرَنِي «أَنَّهُ يَكُونُ بِالْوَزْنِ أَلْفاً وَ مِائَةً وَ سَبْعِينَ وَزْنَةً».
It is narrated from Muhammad ibn Ahmad ibn Yahya, from Ja'far ibn Ibrahim ibn Muhammad Al-Hamadhani, who was with us during Hajj. He said: "I wrote to Abu Al-Hasan عليه السلام through Abu (a messenger), saying: 'May I be your ransom, our companions have differed regarding the measure of the sa': some say Zakat al-Fitr is based on the Madani sa', while others say it is based on the Iraqi sa'.' Imam عليه السلام wrote back to me: 'The sa' is six ritls (weights) by the Madani measure and nine ritls by the Iraqi measure.' Imam عليه السلام further informed me: 'By weight, it is 1,170 weights (units).'"
- Ṣaḥīḥ al-Faqīh, p. 109