Abu Dawud Book 20, Hadith Number 3703.
Chapter : Drink made from raisins or dates nabidh.
Narated By ‘Aisha, Ummul Mu’minin : Amrah said on the authority of ‘Aisha that she would steep dates for the Apostle of Allah (PBUH) in the morning. When the evening came, he took his dinner and drank it after his dinner. If anything remained, she poured it out. She then would steep for him at night. When the morning came, he took his morning meal and drank it after his morning meal. She said: The skin vessel was washed in the morning and in the evening. My father (Hayyan) said to her: Twice a day? She said: Yes.