كتاب البيوع
21  
The Book of Transactions
(13)
Chapter: The prohibition of selling produce before its goodness appears
(13)
باب النَّهْىِ عَنْ بَيْعِ الثِّمَارِ، قَبْلَ بُدُوِّ صَلاَحِهَا بِغَيْرِ شَرْطِ الْقَطْعِ ‏‏
Sahih Muslim 1537

Abu Bakhtari reported:

I asked Ibn 'Abbas (Allah be pleased with them) about the sale of dates. He said: Allah's Messenger (ﷺ) forbade the sale of dates of the trees until one eats them or they are eaten (i. e. they are fit to be eaten) or until they are weighed (or measured). I said: What does it imply:" Until it is weighed"? Thereupon a person who was with him (Ibn Abbas) said: Until he is able to keep it with him (after plucking them).
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ أَبِي الْبَخْتَرِيِّ، قَالَ سَأَلْتُ ابْنَ عَبَّاسٍ عَنْ بَيْعِ النَّخْلِ، فَقَالَ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ بَيْعِ النَّخْلِ حَتَّى يَأْكُلَ مِنْهُ أَوْ يُؤْكَلَ وَحَتَّى يُوزَنَ ‏.‏ قَالَ فَقُلْتُ مَا يُوزَنُ فَقَالَ رَجُلٌ عِنْدَهُ حَتَّى يَحْزَرَ ‏.‏
Reference : Sahih Muslim 1537
In-book reference : Book 21, Hadith 72
USC-MSA web (English) reference : Book 10, Hadith 3674
  (deprecated numbering scheme)