٩ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ جَعْفَرِ بْنِ إِبْرَاهِيمَ بْنِ مُحَمَّدٍ الْهَمَذَانِيِّ وَكَانَ مَعَنَا حَاجّاً قَالَ كَتَبْتُ إِلَى أَبِي الْحَسَنِ (عَلَيْهِ السَّلاَم) عَلَى يَدَيْ أَبِي جُعِلْتُ فِدَاكَ إِنَّ أَصْحَابَنَا اخْتَلَفُوا فِي الصَّاعِ بَعْضُهُمْ يَقُولُ الْفِطْرَةُ بِصَاعِ الْمَدَنِيِّ وَبَعْضُهُمْ يَقُولُ بِصَاعِ الْعِرَاقِيِّ فَكَتَبَ إِلَيَّ الصَّاعُ سِتَّةُ أَرْطَالٍ بِالْمَدَنِيِّ وَتِسْعَةُ أَرْطَالٍ بِالْعِرَاقِيِّ قَالَ وَأَخْبَرَنِي أَنَّهُ يَكُونُ بِالْوَزْنِ أَلْفاً وَمِائَةً وَسَبْعِينَ وَزْنَةً.
9. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ja’far ibn Ibrahim ibn Muhammad al-Hamadaniy who accompanied us to Hajj who has said the following: “I once wrote to abu al-Hassan , through my father asking, ‘I pray to Allah to keep my soul in service for your cause, our people have differences about al-Sa’. Certain ones among them say that it is al-Sa‘ al-Madaniy and others say it is al-‘Iraqiy al-Sa‘. He (the Imam) wrote the answer; ‘Al-Sa‘ is six Artal by al-Madaniy Artal, and nine by al-‘Iraqiy Artal.’ He (the Imam) informed me that it weighs one thousand nine hundred seventy Waznah (a certain unit of measurement).”’ 