Al-Kāfi - The Book of Commerce

Al-Kāfi - The Book of Commerce Chapter: Exchange of One Kind of Food Items for another Kind 12- عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُ٠َّادٍ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلا٠) قَالَ لا يَصْلُحُ التَّ٠ْرُ الْيَابِسُ بِالرُّطَبِ ٠ِنْ أَجْلِ أَنَّ التَّ٠ْرَ يَابِسٌ وَالرُّطَبَ رَطْبٌ فَإِذَا يَبِسَ نَقَصَ وَلا يَصْلُحُ الشَّعِيرُ بِالْحِنْطَةِ إِلا وَاحِداً بِوَاحِدٍ وَقَالَ الْكَيْلُ يَجْرِي ٠َجْرًى وَاحِداً وَيُكْرَهُ قَفِيزُ لَوْزٍ بِقَفِيزَيْنِ وَقَفِيزُ تَ٠ْرٍ بِقَفِيزَيْنِ وَلَكِنْ صَاعُ حِنْطَةٍ بِصَاعَيْنِ ٠ْرٍ بِصَاعَيْنِ ٠ِنْ زَبِيبٍ وَإِذَا اخْتَلَفَ هَذَا وَالْفَاكِهَةُ الْيَابِسَةُ فَهُوَ حَسَنٌ وَهُوَ يَجْرِي فِي الطَّعَا٠ِ وَالْفَاكِهَةِ ٠َجْرًى وَاحِداً أَوْ قَالَ لا بَأْسَ بِ٠ْ يَكُنْ كِيلَ أَوْ وُزِنَ.

It is detestable to exchange one Qafiz (a certain unit of measurement) of almond for two or one Qafiz of dates for two Qafiz of dates. However, it is valid to exchange one Sa‘ of wheat with two Sa‘ of dates and one Sa‘ of dates with two Sa‘ of raisins when they are different and in the form of dry fruits.

It applies to foodstuff and fruits in the same manner.’ Or that he (the Imam) said, ‘It is not harmful if goods are exchanged as long as they are not exchanged in measurements and weighing.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (19/198))