The Messenger of Allah ﷺ forbade a townsman to sell for a man from the desert. I asked: What do you mean by the selling of a townsman for a man from the desert ? He replied: He should not be a broker for him.  

نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ فَقُلْتُ مَا يَبِيعُ حَاضِرٌ لِبَادٍ قَالَ لاَ يَكُونُ لَهُ سِمْسَارًا  

The Prophet ﷺ said: A townsman must not sell for a man from the desert, even if he is his brother or father. Abu Dawud said: Anas b. Malik said: It was said: A townsman must not sell for a man from the desert. This phrase carries a broad meaning. It means that the (the townsman) must not sell anything for him or buy anything for him.  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ يَبِيعُ حَاضِرٌ لِبَادٍ وَإِنْ كَانَ أَخَاهُ أَوْ أَبَاهُ  

That a bedouin told him that he brought a milch she-camel in the time of the Messenger of Allah ﷺ. He alighted with Talhah ibn Ubaydullah (and wanted to sell his milch animal to him). He said: The Prophet ﷺ forbade a townsman to sell for a man from the desert. But go to the market and see who buys from you. consult me thereafter, and then I shall ask you (to sell) or forbid you.  

أَنَّهُ قَدِمَ بِحَلُوبَةٍ لَهُ عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ فَنَزَلَ عَلَى طَلْحَةَ بْنِ عُبَيْدِ اللَّهِ فَقَالَ إِنَّ النَّبِيَّ ﷺ نَهَى أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ وَلَكِنِ اذْهَبْ إِلَى السُّوقِ فَانْظُرْ مَنْ يُبَايِعُكَ فَشَاوِرْنِي حَتَّى آمُرَكَ أَوْ أَنْهَاكَ  

The Messenger of Allah ﷺ as saying: A townsman must not sell for a man from the desert ; and leave people alone, Allah will give them provision from one another.  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَبِعْ حَاضِرٌ لِبَادٍ وَذَرُوا النَّاسَ يَرْزُقِ اللَّهُ بَعْضَهُمْ مِنْ بَعْضٍ