Narrated Abu Musa: When the Prophet fell ill, he said, "Order Abu Bakr to lead the people in prayer." 'Aisha said, "Abu Bakr is a softhearted person. The Prophet gave the same order again and she again gave the same reply. He again said, "Order Abu Bakr (to lead the prayer)! You are (like) the female companions of Joseph." Consequently Abu Bakr led the people in prayer in the life-time of the Prophet
— Sahih Bukhari, Volume 4, Book 55: Prophets, Hadith #599
