It is narrated from a Companion that the Noble Prophet (peace and blessings be upon him) said: Do not meet the caravan bringing trade goods on the way, nor should a townsman sell goods on behalf of a villager. And whoever buys a goat or she-camel whose milk has been withheld, after milking it he will have two options: if he wishes to return it, he must also return one sa’ of grain or dates along with it.