Shama-il Tirmidhi Chapter 28, Hadith Number 2 (187).

Anas radiyallahu anhu says, I gave Rasoolullah sallallahu alaihe wasallam to drink from this cup all those things which are drunk; Nabeedh, milk, etc.

Nabeedh is a drink made by soaking dates, raisins, etc. in water until these things (become soft and) give off its effect. It is a tonic and gives strength. Dates, etc. were soaked for Sayyidina Rasoolullah sallallahu alaihe wasallam at night and he drank it in the morning. It was also sometimes used the next day, provided it did not ferment and become intoxicating.