١١- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنِ الْعَلاءِ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلام) قَالَ سَأَلْتُهُ عَنِ الرَّجُلِ يَدْفَعُ إِلَى الطَّحَّانِ الطَّعَامَ فَيُقَاطِعُهُ عَلَى أَنْ يُعْطِيَ صَاحِبَهُ لِكُلِّ عَشَرَةِ أَرْطَالٍ اثْنَيْ عَشَرَ دَقِيقاً قَالَ لا قُلْتُ فَالرَّجُلُ يَدْفَعُ السِّمْسِمَ إِلَى الْعَصَّارِ وَيَضْمَنُ لَهُ لِكُلِّ صَاعٍ أَرْطَالا مُسَمَّاةً قَالَ لا.
11. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from al-‘Ala’ from Muhammad ibn Muslim who has said the following: “I once asked abu Ja‘far , about the case of a man who gives foodstuff to a flour man under a contract that requires him to return for every ten Artal (plural of ritl, a certain unit of measurement) twelve Artal of flour. He (the Imam) said, ‘No, it is not permissible.’ I then asked about sesame given under a contract to an oil man who guarantees for every Sa‘ a certain Ritl (a certain unit of measurement). He (the Imam) said, ‘No, it is not permissible.’” 