Sahih al-Bukhari 7350
Chapter: A verdict based on opinion proves to be wrong then the verdict will be rejected
Abu Sa`id Al-Khudri and Abu Huraira
Narrated Abu Sa`id Al-Khudri and Abu Huraira:Allah's Messenger (ﷺ) sent the brother of the tribe of Bani Adi Al-Ansari as governor of Khaibar. Then the man returned, bringing Janib (a good kind of date). Allah's Messenger (ﷺ) asked him, "Are all the dates of Khaibar like that?" He replied, "No, by Allah, O Allah's Messenger (ﷺ)! We take one Sa' of these (good) dates for two Sas of mixed dates." Allah's Messenger (ﷺ) then said, "Do not do so. You should either take one Sa of this (kind) for one Sa' of the other; or sell one kind and then buy with its price the other kind (of dates), and you should do the same in weighing."
Reference
Sahih al-Bukhari 7350
In-book reference
Book 96, Hadith 78
USC-MSA web (English)
Vol. 9, Book 92, Hadith 449
Arabic Text
حَدَّثَنَا إِسْمَاعِيلُ، عَنْ أَخِيهِ، عَنْ سُلَيْمَانَ بْنِ بِلاَلٍ، عَنْ عَبْدِ الْمَجِيدِ بْنِ سُهَيْلِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ، أَنَّهُ سَمِعَ سَعِيدَ بْنَ الْمُسَيَّبِ، يُحَدِّثُ أَنَّ أَبَا سَعِيدٍ الْخُدْرِيَّ، وَأَبَا، هُرَيْرَةَ حَدَّثَاهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم بَعَثَ أَخَا بَنِي عَدِيٍّ الأَنْصَارِيَّ وَاسْتَعْمَلَهُ عَلَى خَيْبَرَ، فَقَدِمَ بِتَمْرٍ جَنِيبٍ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَكُلُّ تَمْرِ خَيْبَرَ هَكَذَا ". قَالَ لاَ وَاللَّهِ يَا رَسُولَ اللَّهِ إِنَّا لَنَشْتَرِي الصَّاعَ بِالصَّاعَيْنِ مِنَ الْجَمْعِ. فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَفْعَلُوا، وَلَكِنْ مِثْلاً بِمِثْلٍ، أَوْ بِيعُوا هَذَا وَاشْتَرُوا بِثَمَنِهِ مِنْ هَذَا وَكَذَلِكَ الْمِيزَانُ ".