17- صَفْوَانُ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام)
الرَّجُلُ يَجِيئُنِي بِالْوَرِقِ يَبِيعُنِيهَا يُرِيدُ بِهَا وَرِقاً عِنْدِي فَهُوَ الْيَقِينُ أَنَّهُ لَيْسَ يُرِيدُ الدَّنَانِيرَ لَيْسَ يُرِيدُ إِلا الْوَرِقَ وَلا يَقُومُ حَتَّى يَأْخُذَ وَرِقِي فَأَشْتَرِي مِنْهُ الدَّرَاهِمَ بِالدَّنَانِيرِ فَلا يَكُونُ دَنَانِيرُهُ عِنْدِي كَامِلَةً فَأَسْتَقْرِضُ لَهُ مِنْ جَارِي فَأُعْطِيهِ كَمَالَ دَنَانِيرِهِ وَلَعَلِّي لا أُحْرِزُ وَزْنَهَا فَقَالَ أَلَيْسَ يَأْخُذُ وَفَاءَ الَّذِي لَهُ قُلْتُ بَلَى قَالَ لَيْسَ بِهِ بَأْسٌ.
17. Safwan has narrated from Ishaq ibn ‘Ammar who has said the following:
“This is concerning my question before abu ‘ Abd Allah 
, about the case of a man who came to me with dirham to sell them to me for the dirhams with me. He certainly did not want dinars but he wanted the dirham and he did not leave until he took my dirham. I bought from him dirham in exchange for dinars. His dinars were not with me in complete form so I borrowed from my neighbor and gave to him and perhaps I did not pay attention how much it weighed. He (the Imam) said, Is it, not the case that he takes it to offset what belongs to him?’ I replied, ‘Yes, that is true. He (the Imam) said, ‘It is not unlawful/”
