Sahih Bukhari
Sahih Bukhari Volume 003, Book 040, Hadith Number 566.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 40. Distribution of Water
Narated By Zaid bin Thabit : The Prophet permitted selling the dates of the 'Araya for ready dates by estimating the amount of the former (as they are still on the trees).