Musnad Ahmad 1163:46

Yunus narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Habib ibn al-Shahid, from Maymun ibn Mihran, from Yazid ibn al-Asamm, the nephew of Maymunah, from Maymunah, that she said: "The Prophet, peace and blessings of Allah be upon him, married her while they were both in a state of non-ihram (halalan) at Sarif, after he had returned."