Sahih Bukhari
Distribution of Water
Volume: 003 / Book Number: 040 / Hadith Number: 568
Narrated Abu Huraira:
The Prophet allowed the sale of the dates of the 'Araya for ready dates by estimating the former which should be estimated as less than five Awsuq or five Awsuq. (Dawud, the sub-narrator is not sure as to the right amount.)