Sahih Bukhari Volume 9, Book 86, Hadith Number 99.

Narrated By Al-Qasim : A woman from the offspring of Ja’far was afraid lest her guardian marry her (to somebody) against her will. So she sent for two elderly men from the Ansar, ‘AbdurRahman and Mujammi’, the two sons of Jariya, and they said to her, “Don’t be afraid, for Khansa’ bint Khidam was given by her father in marriage against her will, then the Prophet cancelled that marriage.” (See Hadith No. 78)