Commercial Transactions (Kitab Al-Buyu)
Dawud :: Book 22 : Hadith 3387
Narrated Rafi' ibn Khadij:
Hanzalah ibn Qays said that he asked Rafi' ibn Khadij about the lease of land. He replied: The Apostle of Allah (peace_be_upon_him) forbade the leasing of land. I asked: (Did he forbid) for gold and silver (i.e. dinars and dirhams)? He replied: If it is against gold and silver, then there is no harm in it.