Sahih al-Bukhari 2160
Sahih al-Bukhari · Book 34: Sales and Trade · A town dweller should not buy goods for a desert dweller and charge commission as a broker
Narrated Abu Huraira:
حَدَّثَنَا الْمَكِّيُّ بْنُ إِبْرَاهِيمَ ، قَالَ أَخْبَرَنِي ابْنُ جُرَيْجٍ ، عَنِ ابْنِ شِهَابٍ ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ ، أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ يَبْتَاعُ الْمَرْءُ عَلَى بَيْعِ أَخِيهِ، وَلاَ تَنَاجَشُوا، وَلاَ يَبِعْ حَاضِرٌ لِبَادٍ "
Allah's Messenger (ﷺ) said, "A buyer should not urge a seller to restore a purchase so as to buy it himself, and do not practice Najsh; and a town dweller should not sell goods of a desert dweller."