Al-Kāfi - The Book of Commerce

Al-Kāfi - The Book of Commerce Chapter: Exchange of One Kind of Food Items for another Kind َّدُ بْنُ يَحْيَى عَنْ أَحْ٠ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْ٠َّدِ بْنِ أَبِي نَصْرٍ عَنْ أَبَانٍ عَنْ عَبْدِ الرَّحْ٠َنِ بْنِ أَبِي عَبْدِ اللهِ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلا٠) أَيَجُوزُ قَفِيزٌ ٠ِنْ حِنْطَةٍ بِقَفِيزَيْنِ ٠ِنْ شَعِيرٍ فَقَالَ لا يَجُوزُ إِلا ٠َّ قَالَ إِنَّ الشَّعِيرَ ٠5.

Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad and a number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from Aban from ‘Abd al-Rahman ibn abu ‘Abd Allah who has said the following: “This is concerning my question before abu ‘Abd Allah (a.s.), if it is permissible to exchange one Qafiz (a certain unit of measurement) of wheat for two Qafiz of barley.

He (the Imam) said, ‘No, it is not permissible unless they are of equal quantities.’ He (the Imam) then said, ‘Barley is from wheat.’” وثق كالصحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (19/195))