27- مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ
قُلْتُ لَهُ تَجِيئُنِي الدَّرَاهِمُ بَيْنَهَا الْفَضْلُ فَنَشْتَرِيهِ بِالْفُلُوسِ فَقَالَ لا يَجُوزُ وَلَكِنِ انْظُرْ فَضْلَ مَا بَيْنَهُمَا فَزِنْ نُحَاساً وَزِنِ الْفَضْلَ فَاجْعَلْهُ مَعَ الدَّرَاهِمِ الْجِيَادِ وَخُذْ وَزْناً بِوَزْنٍ.
27. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ‘Isa from ‘Uthman ibn ‘Isa from Ishaq ibn ‘Ammar who has said the following: “I once said to him (the Imam) 
, ‘We receive dirhams of different weight, then we buy them with al-Fulus,’ He (the Imam) said,
‘It is not lawful. Find the difference, then weigh copper and the difference then place it in good dirhams then take in equal weight.’”
