What was the Prophet (saw) forbidding the Ansar to do concerning rental of land?
 Narrated Rafi` bin Khadij:                     We used to work on the fields more than the other Ansar, and we used to rent the land (for the yield of a specific portion of it). But sometimes that portion or the rest of the land did not give any yield, so we were forbidden (by the Prophet ) to follow such a system, but we were allowed to rent the land for money.