Sahih Bukhari

Narrated Hamza's father: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