Musnad Ahmad 30:1867

Affan narrated to us, Hammad ibn Salamah narrated to us, from Muhammad ibn Amr, from Abu Salamah, from Abu Hurairah, from the Prophet, peace and blessings of Allah be upon him, who said: "If she consents, then she has her consent, and if she dislikes it, then there is no authority over her," meaning the orphan girl.