(59) باب مَنْ بَنَى بِامْرَأَةٍ وَهْىَ بِنْتُ تِسْعِ سِنِينَ
Narrated 'Urwa:
The Prophet (ﷺ) wrote the (marriage contract) with `Aisha while she was six years old and consummated his marriage with her while she was nine years old and she remained with him for nine years (i.e. till his death).
Reference: Sahih al-Bukhari 5158
In-book reference: Book 67, Hadith 93
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 88