Maimunah bint Harith narrated:
that the Messenger of Allah married her when he was Halal (not in Ihram). (Sahih).He (one of the narrators-Yazid) said: "And she was my maternal aunt and the maternal aunt of Idn 'Abbas also."
English reference: Vol. 3, Book 9, Hadith 1964
Arabic reference: Book 9, Hadith 2040