narrated from Abu Hurairah ra. : Prophet forbade selling goods on behalf of the city dwellers desert dwellers, as well as with najsh. and one should not recommend to buyers who have reached an agreement with another vendor to cancel the deal, so he switched him to buy his wares; as well as one can not woo a girl who has dipinang different people and a woman is forbidden to be the cause of divorced women another with the intent to take his place.