Abu Dawud Book 17, Hadith Number 3460.
Chapter : Not known.
Narated By Abdullah ibn Umar : A man paid in advance for a palm-tree. It did not bear fruit that year. They brought their case for decision to the Prophet (PBUH). He said: for which do you make his property lawful? He then said: Do not pay in advance for a palm-tree till they (the fruits) were clearly in good condition.