"A City-dweller should not sell for a Bedouin."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَبِيعُ حَاضِرٌ لِبَادٍ  

"A city-dweller should not sell for a Bedouin. Leave people to (engage in trade) and Allah will grant them provision through one another."  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ يَبِيعُ حَاضِرٌ لِبَادٍ دَعُوا النَّاسَ يَرْزُقُ اللَّهُ بَعْضَهُمْ مِنْ بَعْضٍ  

"The Messenger of Allah ﷺ forbade a city-dweller to sell for a Bedouin." (Sahih)I (Tawus) said to Ibn 'Abbas: "What is meant by the words: 'A city-dweller selling for a Bedouin?' He said: "He should not be a broker for him."  

نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ قُلْتُ لاِبْنِ عَبَّاسٍ مَا قَوْلُهُ حَاضِرٌ لِبَادٍ قَالَ لاَ يَكُونُ لَهُ سِمْسَارًا