It was narrated from Ibn Tawus, from his father, that Ibn ‘Abbas said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم forbade meeting the riders, and for a town-dweller to sell for a desert-dweller.” I said to Ibn ‘Abbas: “What does a town-dweller (selling) for a desert-dweller mean?” He said: “He should not act as a broker for him.” (Sahih)