Sahih Bukhari Hadith: Uroowaa (ra) narrated, " Nabi Karim (sa) himself proposed to marry Aisha Bint Abu Bakr while Aisha was only six year old girl. Then, Abu Bakr said, O Messenger of God, I am your brother, how can you marry my daughter ?' On reply Nabi karim (sa) said, you are my brother only in the religion. Therefore, Ai'sha is halal for me to marry".
