From Sahih Muslim (Hadith 5134):
Anas reported:I was standing amongst the members of my (tribe) and serving them liquor. The rest of the hadith is the same, but with this variation that Abu Bakr b. Anas said: It was their liquor in those days (prepared from dates), and Anas was present there and he did not deny this (fact) Mu'tamir reported on the authority of his father: A person who was with me told me that he had heard Anas saying that that was their liquor in those days
Reference: Muslim 5134