It was narrated from Ibn 'Umar that: the Messenger of Allah forbade meeting traders on the way.
It was narrate from Ibn Tawus, from his father, that Ibn 'Abbas said; The Messenger of Allah forbade meeting the riders, and for a town-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,
Abu Hurairah said: The Messenger of Allah said: 'Do and whoever meets any of them and buys from him the vendor has the choice of annulling the transaction when he comes to the marketplace. '