Early in 623 , Abu Bakr 's daughter Aisha , who was already engaged to Muhammad , was handed over to Muhammad in a simple marriage ceremony .
This further strengthened the relation between Abu Bakr and Muhammad .
Early in 623 , Abu Bakr 's daughter Aisha , who was already engaged to Muhammad , was handed over to Muhammad in a simple marriage ceremony , and this further strengthened the relation between Abu Bakr and Muhammad .