Chapter 27: Drinks (Kitab Al-Ashribah)
Narrated Aisha, Ummul Mu' minin: Amrah said on the authority of Aisha that she would steep dates for the Messenger of Allah (ﷺ) 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.
Sunan Abi Dawud 3712