Sahih Muslim , Book 8, Hadith 3310 (USC-MSA) ⓘ

'A'isha (Allah be pleased with her) reported: Allah's Apostle married me when I was six years old, and I was admitted to his house when I was nine years old.

وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا أَبُو مُعَاوِيَةَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، ح وَحَدَّثَنَا ابْنُ نُمَيْرٍ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا عَبْدَةُ، - هُوَ ابْنُ سُلَيْمَانَ - عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ تَزَوَّجَنِي النَّبِيُّ صلى الله عليه وسلم وَأَنَا بِنْتُ سِتِّ سِنِينَ وَبَنَى بِي وَأَنَا بِنْتُ تِسْعِ سِنِينَ ‏.‏

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Key Source: Marriage to Aisha

Maybe one of the most controversial areas of Muhammed's life was his marriage to a child bride, Aisha. According to Muslim sources, Muhammad married her in his 50s, while she was 6 years old, and the marriage was consummated when she was 9 years old. This relationship in particular is seen...

Key Sources

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also referenced under: Book 16, Hadith 82 (In-Book) & Hadith 1422 (Reference)