عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنْ يُتَلَقَّى الرُّكْبَانُ أَوْ يَبِيعَ حَاضِرٌ لِبَادٍ
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him and his family) forbade meeting trade caravans on the way and forbade a townsman from buying and selling on behalf of a villager.