Sunan at-Tirmithiy كتاب البيوع باب ما جاء فى النهى عن المحاقلة والمزابنة

حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا مَالِكُ بْنُ أَنَسٍ عَنْ عَبْدِ اللَّهِ بْنِ يَزِيدَ أَنَّ زَيْدًا أَبَا عَيَّاشٍ سَأَلَ سَعْدًا عَنِ الْبَيْضَاءِ بِالسُّلْتِ فَقَالَ أَيُّهُمَا أَفْضَلُ قَالَ الْبَيْضَاءُ. فَنَهَى عَنْ ذَلِكَ. وَقَالَ سَعْدٌ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُسْأَلُ عَنِ اشْتِرَاءِ التَّمْرِ بِالرُّطَبِ فَقَالَ لِمَنْ حَوْلَهُ أَيَنْقُصُ الرُّطَبُ إِذَا يَبِسَ. قَالُوا نَعَمْ. فَنَهَى عَنْ ذَلِكَ.
Zayd Abū-‘Ayyāsh asked Sa'd Ibn-Abī-Waqqāṣ about [purchasing] white barley with hulless barley (1). Sa'd asked, “Which one is superior?” Abū-‘Ayyāsh replied, “The white barely.” So Sa'd forbade that (2) and said, "I heard the Messenger of God, peace and blessings of God be upon him, when asked about the purchase of dried dates with ripe dates, enquire from those around him, 'Do ripe dates decrease (in value or in weight) as they dry?' They replied, 'Yes!' So he forbade that (3)." Footnotes: (1) Two different varieties of barely. (2) i.e. the exchange of superior white grain (without the hulls) for inferior unthreshed grain. (3) i.e. the exchange of ripe dates for dried dates. Click on ḥadīth to read more