(6) باب مَنَاقِبُ عُمَرَ بْنِ الْخَطَّابِ أَبِي حَفْصٍ الْقُرَشِيِّ الْعَدَوِيِّ رَضِيَ اللَّهُ عَنْهُ
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."
Reference: Sahih al-Bukhari 3681
In-book reference: Book 62, Hadith 31
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 57, Hadith 30