Volume 1, Book 11, Number 646:
Narrated Abu Musa:
“The Prophet became sick and when his disease became aggravated, he said, “Tell Abu Bakr to lead
the prayer.” ‘Aisha said, “He is a soft-hearted man and would not be able to lead the prayer in your
place.” The Prophet said again, “Tell Abu Bakr to lead the people in prayer.” She repeated the same
reply but he said, “Tell Abu Bakr to lead the people in prayer. You are the companions of Joseph.” So
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SAHIH BUKHARI VOLUME 1 > BOOK 11: CALL TO PRAYERS (ADHAAN)
the messenger went to Abu Bakr (with that order) and he led the people in prayer in the lifetime of
the Prophet.