Sahih Muslim Book 8, Hadith Number 3306.

Chapter: Seeking consent of al-Thayyib in marriage in words and of a virgin in (meaningful) silence.

Ibn ‘Abbas (Allah be pleased with him) reported Allah’s Apostle (May peace be upon him) as saying: A woman without a husband has wore right to her person than her guardian, and a virgin’s consent must be asked from her, and her silence implies her consent.