Sahih Bukhari
Interpretation of Dreams
Volume: 009 / Book Number: 087 / Hadith Number: 157
Narrated 'Abdullah bin 'Umar:
I heard Allah's Apostle 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 Apostle?" The Prophet said. "(It is Religious) knowledge."