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." (DE)
English reference (DE): Vol. 3, Book 12, Hadith 2177 (DE)
Arabic reference (DE): Book 12, Hadith 2261 (DE)