Sahih al-Bukhari
Sahih al-Bukhari 2172, 2173
حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى عَنِ الْمُزَابَنَةِ قَالَ وَالْمُزَابَنَةُ أَنْ يَبِيعَ الثَّمَرَ بِكَيْلٍ، إِنْ زَادَ فَلِي وَإِنْ نَقَصَ فَعَلَىَّ. قَالَ وَحَدَّثَنِي زَيْدُ بْنُ ثَابِتٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم رَخَّصَ فِي الْعَرَايَا بِخَرْصِهَا.
Abu al-Numan narrated to us: Hammad ibn Zayd narrated to us, from Ayyub, from Nafi, from Ibn Umar, may Allah be pleased with them both, that the Prophet forbade muzabana. He said: Muzabana is selling produce by measure with the stipulation, “If it is more, the excess is mine; if it is less, the shortfall is upon me.” He also said: Zayd ibn Thabit narrated to me that the Prophet granted a concession for araya transactions based on estimation.
Translation notes
The report gives a formula for the exchange involved in muzabana, then adds a separate report from Zayd ibn Thabit granting an exception for araya transactions valued by estimation.