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Narrated Ibn 'Umar:

I saw the people buy foodstuff randomly (i.e. blindly without measuring it) in the life-time of Allah's Apostle and they were punished (by beating), if they tried to sell it before carrying it to their own houses.
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي سَالِمُ بْنُ عَبْدِ اللَّهِ، أَنَّ ابْنَ عُمَرَ ـ رضى الله عنهما ـ قَالَ لَقَدْ رَأَيْتُ النَّاسَ فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم يَبْتَاعُونَ جِزَافًا ـ يَعْنِي الطَّعَامَ ـ يُضْرَبُونَ أَنْ يَبِيعُوهُ فِي مَكَانِهِمْ حَتَّى يُؤْوُوهُ إِلَى رِحَالِهِمْ‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 2137
• Sahih al-Bukhari, Vol. 3, Book of Sales and Trade, Hadith 347
• Sahih al-Bukhari, Book of Sales and Trade, Hadith 347