The Book of Transactions
21/9. Chapter:
The prohibition of selling a heap of dates the weight of which is unknown
Sahih Muslim
حَدَّثَنِي أَبُو الطَّاهِرِ، أَحْمَدُ بْنُ عَمْرِو بْنِ سَرْحٍ أَخْبَرَنَا ابْنُ وَهْبٍ، حَدَّثَنِي ابْنُ جُرَيْجٍ، أَنَّ أَبَا الزُّبَيْرِ، أَخْبَرَهُ قَالَ سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ، يَقُولُ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ بَيْعِ الصُّبْرَةِ مِنَ التَّمْرِ لاَ يُعْلَمُ مَكِيلَتُهَا بِالْكَيْلِ الْمُسَمَّى مِنَ التَّمْرِ .
Jabir b. Abdullah (Allah be pleased with them) is reported to have said that Allah's Messenger (ﷺ) forbade the sale of a heap of dates the weight of which is unknown in accordance with the known weight of dates.
Reference : Sahih Muslim 1530aIn-book reference : Book 21, Hadith 50USC-MSA web (English) reference : Book 10, Hadith 3654