Abu Zara' bin 'Amr /Harm أبو زرعة بن عمرو/هرم · The Chapters on Business Transactions

"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."