"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."
Sunan Ibn Majah Book 12, Hadith 41
← Previous Hadith "A city-dweller should not sell for a Bedouin. Leave people to (engage in trade) and Allah will grant them provision through one another."

Sunan Ibn Majah Book 12, Hadith 40 Next Hadith → "Do not meet the traders on the way, and whoever meets any of them and buys from him, the vendor has the choice of annulling the transaction when he comes to the marketplace.''

Sunan Ibn Majah Book 12, Hadith 42