Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2840 (DarusSalam) ⓘ
It was narrated that Ibn Abbas said: "The Prophet married Maimunah when he was in Ihram."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا دَاوُدُ، - وَهُوَ ابْنُ عَبْدِ الرَّحْمَنِ الْعَطَّارُ - عَنْ عَمْرٍو، - وَهُوَ ابْنُ دِينَارٍ - قَالَ سَمِعْتُ أَبَا الشَّعْثَاءِ، يُحَدِّثُ عَنِ ابْنِ عَبَّاسٍ، قَالَ تَزَوَّجَ النَّبِيُّ صلى الله عليه وسلم مَيْمُونَةَ وَهُوَ مُحْرِمٌ .
also referenced under: Hadith 2837 (Reference) & Book 24, Hadith 0 (In-Book)