(5) باب تَحْرِيمِ نِكَاحِ الْمُحْرِمِ وَكَرَاهَةِ خِطْبَتِهِ
Yazid b. al-Asamm reported:
Maimuna daughter of al-Harith narrated to me that Allah's Messenger (ﷺ) married her and he was not in the state of Ihram. And she (Maimuna) was my mother's sister and that of Ibn 'Abbas (Allah be pleased with them).
Reference: Sahih Muslim 1411
In-book reference: Book 16, Hadith 56
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3285