7- أَبُو عَلِيٍّ الأشْعَرِيُّ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنْ إِسْحَاقَ بْنِ عَمَّارٍ قَالَ
سَأَلْتُ أَبَا إِبْرَاهِيمَ (عَلَيْهِ السَّلام) عَنِ الرَّجُلِ يَبِيعُنِي الْوَرِقَ بِالدَّنَانِيرِ وَأَتَّزِنُ مِنْهُ فَأَزِنُ لَهُ حَتَّى أَفْرُغَ فَلا يَكُونُ بَيْنِي وَبَيْنَهُ عَمَلٌ إِلا أَنَّ فِي وَرِقِهِ نُفَايَةً وَزُيُوفاً وَمَا لا يَجُوزُ فَيَقُولُ انْتَقِدْهَا وَرُدَّ نُفَايَتَهَا فَقَالَ لَيْسَ بِهِ بَأْسٌ وَلَكِنْ لا تُؤَخِّرْ ذَلِكَ أَكْثَرَ مِنْ يَوْمٍ أَوْ يَوْمَيْنِ فَإِنَّمَا هُوَ الصَّرْفُ قُلْتُ فَإِنْ وَجَدْتُ فِي وَرِقِهِ فَضْلا مِقْدَارَ مَا فِيهَا مِنَ النُّفَايَةِ فَقَالَ هَذَا احْتِيَاطٌ هَذَا أَحَبُّ إِلَيَّ.
7. Abu Ali al-Ash’ariy has narrated from Muhammad ibn ‘Abd al-Jabbar from Safwan ibn Yahya from Ishaq ibn ‘Ammar who has said the following:
“I once asked Abu Ibrahim 
, about the case of a man who sold to me wariq (dirham) for dinar and I weighed it from him. I weighed it for him until it was complete and there was no other work between us, except that his wariq (dirham) had invalid and unreal pieces, and what was not permissible in them. He asked me to find and return such pieces. He (the Imam) said, It is not unlawful; however, you must not delay it more than one day or two, because it is an exchange. I then asked, ’What happens if I find extra in them equal to the amount of invalid ones ? He (the Imam) said, ‘This is a precautionary measure and I like it more.
