Sahih al-Bukhari 2167
Sahih al-Bukhari · Book 34: Sales and Trade · The limits to which one can go ahead to meet the caravan
Narrated `Abdullah:
حَدَّثَنَا مُسَدَّدٌ ، حَدَّثَنَا يَحْيَى ، عَنْ عُبَيْدِ اللَّهِ ، قَالَ حَدَّثَنِي نَافِعٌ ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ كَانُوا يَبْتَاعُونَ الطَّعَامَ فِي أَعْلَى السُّوقِ فَيَبِيعُونَهُ فِي مَكَانِهِمْ، فَنَهَاهُمْ رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ يَبِيعُوهُ فِي مَكَانِهِ حَتَّى يَنْقُلُوهُ.
Some people used to buy foodstuff at the head of the market and used to sell it on the spot. Allah's Apostle forbade them to sell it till they brought it to (their) places.