The Book of Transactions (Kitab Al-Buyu`)
Muslim :: Book 10 : Hadith 3728
Jabir (Allah be pleased with him) reported Allah's Apostle (may peace be upon him) forbidding selling of (produce) in advance for two years, and in the narmtion of Ibu Abd Shaiba (the words are):" Selling of the fruits (on the tree) in advance for two years."