Sahih Bukhari Volume 003, Book 039, Hadith Number 532.
Narated By Rafi bin Khadij : My uncle Zuhair said, "Allah's Apostle forbade us to do a thing which was a source of help to us." I said, "Whatever Allah's Apostle said was right." He said, "Allah's Apostle sent for me and asked, 'What are you doing with your farms?' I replied, 'We give our farms on rent on the basis that we get the yield produced at the banks of the water streams (rivers) for the rent, or rent it for some Wasqs of barley and dates.' Allah's Apostle said, 'Do not do so, but cultivate (the land) yourselves or let it be cultivated by others gratis, or keep it uncultivated.' I said, 'We hear and obey.'