Chapter 45: The Book of the Merits of the Companions
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.
Sahih Muslim 2391a