Sahih Bukhari Volume 007, Book 069, Hadith Number 488.
Narrated By Anas bin Malik : I was serving Abu 'Ubaida, Abu Talha and Ubai bin Ka'b with a drink prepared from ripe and unripe dates. Then somebody came to them and said, "Alcoholic drinks have been prohibited." (On hearing that) Abu Talha said, "Get up. O Anas, and pour (throw) it out! So I poured (threw) it out.