Hadith #3523 (Sahih al-Bukhari)
Book: Companions of the Prophet
Narrator(s): Hamza's father
Grade: Sahih

Allah’s Messenger (ﷺ) said, “While I was sleeping, I saw myself drinking (i.e. milk), and I was so contented that I saw the milk flowing through my nails. Then I gave (the milk) to `Umar.” They (i.e. the companions of the Prophet) asked, “What do you interpret it?” He said, “Knowledge.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-3523/