What did the Prophet Muhammad (saw) say when Abu Bakr expressed his concern about him marrying his daughter `Aisha?
 Narrated 'Ursa:                     The Prophet asked Abu Bakr for `Aisha's hand in marriage. Abu Bakr said "But I am your brother." The Prophet said, "You are my brother in Allah's religion and His Book, but she (Aisha) is lawful for me to marry."