(37) باب الرُّخْصَةِ فِي نِكَاحِ الْمُحْرِمِ .
It was narrated from Ibn 'Abbas that the Messenger of Allah married Maimunah when he was a Muhrim.
Reference: Sunan an-Nasa'i 3274
In-book reference: Book 26, Hadith 79
English translation: Vol. 4, Book 26, Hadith 3276