Ibn Tawus narrated from his father that Ibn 'Abbas said:
"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."
English reference: Vol. 3, Book 12, Hadith 2177
Arabic reference: Book 12, Hadith 2261