15- وَعَنْهُ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنْ عَبْدِ اللهِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ يَحْيَى الْحَلَبِيِّ عَنِ الثُّمَالِيِّ قَالَ
مَرَرْتُ مَعَ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) فِي سُوقِ النُّحَاسِ فَقُلْتُ جُعِلْتُ فِدَاكَ هَذَا النُّحَاسُ أَيُّ شَيْءٍ أَصْلُهُ فَقَالَ فِضَّةٌ إِلا أَنَّ الأرْضَ أَفْسَدَتْهَا فَمَنْ قَدَرَ عَلَى أَنْ يُخْرِجَ الْفَسَادَ مِنْهَا انْتَفَعَ بِهَا.
15. It is narrated from the narrator of the previous Hadith from Ahmad ibn Muhammad from ibn Faddal from ‘Abd Alfah ibn ‘Abd al- Rahman from Yahya ai-Haiabiy from ai-Thumaliy who has said the foiiowing: “I once passed with abu ‘Abd Allah 
, through the copper market and I asked, ‘I pray to Allah to keep my soul in service for your cause, what is the origin of the copper?’ He (the Imam) said,
‘It is silver but the land spoils it and if one can take away the invalidity, he can benefit from it.’”
