عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ حَدَّثَهُمْ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَبْعَثُ عَلَيْهِمْ إِذَا ابْتَاعُوا مِنَ الرُّكْبَانِ الْأَطْعِمَةَ مَنْ يَمْنَعُهُمْ أَنْ يَتَبَايَعُوهَا حَتَّى يُؤْوُوهَا إِلَى رِحَالِهِمْ
Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that when people used to buy grain from caravans, the Messenger of Allah (peace and blessings be upon him) would send (his representatives) to the buyers, who would prohibit them from selling that commodity further until they had brought it to their own places.