From Sahih Bukhari (Hadith 7007):
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) said, "While I was sleeping, I was given a bowl full of milk (in the dream) and I drank from it (to my fill) till I noticed its wetness coming out of my limbs. Then I gave the rest of it to `Umar bin Al-Khattab." The persons sitting around him, asked, "What have you interpreted (about the dream) O Allah's Messenger (ﷺ)?" He said, "(It is religious) knowledge
Reference: Bukhari 7007