Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Prophet Muhammad (peace and blessings be upon him) said: "A widow should not be married without her permission, nor should a virgin be married without her permission." The people asked, "O Messenger of Allah! How is the permission of a virgin?" He (peace be upon him) said: "Her silence is her consent."
Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) narrates: I said, "O Messenger of Allah! A virgin girl feels shy." The Prophet (peace be upon him) said, "Her silence is her consent."