Sahih Bukhari Volume 5, Book 58, Hadith Number 235.

Narated By ‘Aisha : That the Prophet said to her, “You have been shown to me twice in my dream. I saw you pictured on a piece of silk and some-one said (to me). ‘This is your wife.’ When I uncovered the picture, I saw that it was yours. I said, ‘If this is from Allah, it will be done.”