(22) باب فَضْلِ الْعِلْمِ
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) said, "While I was sleeping, I saw that a cup full of milk was brought to me and I drank my fill till I noticed (the milk) its wetness coming out of my nails. Then I gave the remaining milk to `Umar Ibn Al-Khattab" The companions of the Prophet (ﷺ) asked, "What have you interpreted (about this dream)? "O Allah's Messenger (ﷺ) ,!" he replied, "(It is religious) knowledge."
Reference: Sahih al-Bukhari 82
In-book reference: Book 3, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 3, Hadith 82