(2) باب مِنْ فَضَائِلِ عُمَرَ رضى الله تعالى عنه
Hamza b. Abdullah b. 'Umar b. Khattab reported on the authority of his father that Allah's Messenger (ﷺ) said:
While I was asleep I saw (in a dream) a cup containing milk being presented to me. I took out of that until I perceived freshness being reflected through my nails. Then I presented the leftover to 'Umar b. Khattab. They said: Allah's Messenger: How do you interpret it? He said: This implies knowledge.
Reference: Sahih Muslim 2391 a
In-book reference: Book 44, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Book 31, Hadith 5888