(10) باب تَزْوِيجِ الأَبِ الْبِكْرَ الصَّغِيرَةَ
'A'isha (Allah be pleased with her) reported that Allah's Apostle (ﷺ) married her when she was seven years old, and he was taken to his house as a bride when she was nine, and her dolls were with her; and when he (the Holy Prophet) died she was eighteen years old.
Reference: Sahih Muslim 1422 c
In-book reference: Book 16, Hadith 83
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3311