Sahih Muslim Book 8, Hadith Number 3305.
Chapter: Seeking consent of al-Thayyib in marriage in words and of a virgin in (meaningful) silence.
‘Aisha (Allah be pleased with her) reported: I asked Allah’s Messenger (May peace be upon him) about a virgin whose marriage is solemnised by her guardian, whether it was necessary or not to consult her. Allah’s Messenger (May peace be upon him) said: Yes, she must be consulted. ‘Aisha reported: I told him that she feels shy, whereupon Allah’s Messenger (May peace be upon him) said: Her silence implies her consent.