(14) باب أَجْرِ السَّمْسَرَةِ
Narrated Tawus:
Ibn `Abbas said, "The Prophet (ﷺ) 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 meaning 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."
Reference: Sahih al-Bukhari 2274
In-book reference: Book 37, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 36, Hadith 474