19- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ عَنْ أَبِي الْمَغْرَاءِ عَنْ أَبِي بَصِيرٍ قَالَ
قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) آتِي الصَّيْرَفِيَّ بِالدَّرَاهِمِ أَشْتَرِي مِنْهُ الدَّنَانِيرَ فَيَزِنُ لِي بِأَكْثَرَ مِنْ حَقِّي ثُمَّ أَبْتَاعُ مِنْهُ مَكَانِي بِهَا دَرَاهِمَ قَالَ لَيْسَ بِهَا بَأْسٌ وَلَكِنْ لا تَزِنْ أَقَلَّ مِنْ حَقِّكَ.
19. A number of our people have narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Fadalah from abu al-Mighra’ from abu Basir who has said the following:
“I once said to abu ‘Abd Allah 
, ‘I go to the money changer with dirhams and buy from him dinars. He weighs for me more than my right. I then at the same place buy from him with it dirhams. He (the Imam) said, ‘It is not unlawful but do not weigh less than your right.’”
