صحيح البخاري

Narrated `Abdullah bin `Umar:

I heard Allah's Messenger (ﷺ) saying, "While I was sleeping, I saw that a cup full of milk was brought to me and I drank of it and gave the remaining of it to `Umar bin Al-Khattab." They asked. What have you interpreted (about the dream)? O Allah's Messenger?" The Prophet (ﷺ) said. "(It is Religious) knowledge."