Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2843 (DarusSalam) ⓘ
It was narrated from Ibn Abbas: That the Messenger of Allah married Maimunah when he was in Ihram.
أَخْبَرَنَا مُحَمَّدُ بْنُ إِسْحَاقَ الصَّاغَانِيُّ، قَالَ حَدَّثَنَا أَحْمَدُ بْنُ إِسْحَاقَ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ حُمَيْدٍ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم تَزَوَّجَ مَيْمُونَةَ وَهُوَ مُحْرِمٌ .
also referenced under: Hadith 2840 (Reference) & Book 24, Hadith 0 (In-Book)