(29) باب إِنْكَاحِ الرَّجُلِ ابْنَتَهُ الصَّغِيرَةَ .
It was narrated from 'Aishah that the Messenger of Allah married her when she was six years old, and consummated the marriage with her when she was nine.
Reference: Sunan an-Nasa'i 3255
In-book reference: Book 26, Hadith 60
English translation: Vol. 4, Book 26, Hadith 3257