Volume 3, Book 36, Number 474:
Narrated Tawus:
Ibn ‘Abbas said, “The Prophet forbade the meeting of caravans (on the way) and ordained that no
townsman is permitted to sell things on behalf of a bedouin.” I asked Ibn ‘Abbas, “What is the mean –
ing of his saying, ‘No townsman is permitted to sell things on behalf of a bedouin.’ ” He replied, “He
should not work as a broker for him.”