Sahih Bukhari Volume 009, Book 085, Hadith Number 079.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 85. Saying Something under Compulsion (Ikraah)
Narrated By 'Aisha : I asked the Prophet, "O Allah's Apostle! Should the women be asked for their consent to their marriage?" He said, "Yes." I said, "A virgin, if asked, feels shy and keeps quiet." He said, "Her silence means her consent."