Sahih Bukhari Volume 7, Book 62, Hadith Number 57.

Narrated By ‘Aisha : Allah’s Apostle said (to me), “You were shown to me in a dream. An angel brought you to me, wrapped in a piece of silken cloth, and said to me, ‘This is your wife.’ I removed the piece of cloth from your face, and there you were. I said to myself. ‘If it is from Allah, then it will surely be.'”