What did the Prophet Muhammad (saw) forbid when one buys a sheep which has not been milked for a long time?
 Narrated `Abdullah bin Mas`ud:                     Whoever buys a sheep which has not been milked for a long time, has the option of returning it along with one Sa of dates; and the Prophet forbade going to meet the seller on the way (as he has no knowledge of the market price and he may sell his goods at a low price).