Musnad Ahmad 1167:35

Rawh narrated to us, Shu'bah narrated to us, from Muslim al-Qurri, who said: I asked Ibn Abbas about the Mut'ah of Hajj, and he permitted it, while Ibn al-Zubayr used to forbid it. He said: "This is the mother of Ibn al-Zubayr, she narrates that the Messenger of Allah (peace and blessings of Allah be upon him) permitted it, so go in to her and ask her." He said: So we went in to her, and she was a large, blind woman. She said: "The Messenger of Allah (peace and blessings of Allah be upon him) has indeed permitted it."