Sahih Bukhari Volume 7, Book 62, Hadith Number 111.

Narrated By Sahl : When Abu Usaid As-Sa’idi got married, he invited the Prophet and his companions. None prepared the food for them and brought it to them but his wife. She soaked some dates in water in a stone pot overnight, and when the Prophet had finished his food, she provided him with that drink (of soaked dates).