٩- مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنْ صَفْوَانَ عَنِ ابْنِ مُسْكَانَ عَنْ إِسْحَاقَ الْمَدَائِنِيِّ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنِ الْقَوْمِ يَدْخُلُونَ السَّفِينَةَ يَشْتَرُونَ الطَّعَامَ فَيَتَسَاوَمُونَ بِهَا ثُمَّ يَشْتَرِي رَجُلٌ مِنْهُمْ فَيَتَسَاءَلُونَهُ فَيُعْطِيهِمْ مَا يُرِيدُونَ مِنَ الطَّعَامِ فَيَكُونُ صَاحِبُ الطَّعَامِ هُوَ الَّذِي يَدْفَعُهُ إِلَيْهِمْ وَيَقْبِضُ الثَّمَنَ قَالَ لا بَأْسَ مَا أَرَاهُمْ إِلا وَقَدْ شَرِكُوهُ فَقُلْتُ إِنَّ صَاحِبَ الطَّعَامِ يَدْعُو كَيَّالا فَيَكِيلُهُ لَنَا وَلَنَا أُجَرَاءُ فَيُعَيِّرُونَهُ فَيَزِيدُ وَيَنْقُصُ قَالَ لا بَأْسَ مَا لَمْ يَكُنْ شَيْ‏ءٌ كَثِيرٌ غَلَطٌ. 
9. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan from ibn Muskan from Ishaq al-Mad’iniy who has said the following: “This is concerning my question before abu ‘Abd Allah , about the case of a people who embark in a ship and buy food and bargain about it. Then one man buys from them. They ask him and he gives them what they ask for of food. So he who collects payment and gives them food becomes the owner of food. He (the Imam) said, ‘It is not harmful. I do not see anything else except that they were partners.’ I then said, ‘The owner of food asks a measuring person who measures for us and we have workers who examine and finds increases and decreases. He (the Imam) said, ‘It is not harmful if errors are not many.’” 