Sahih al-Bukhari 678

Ishaq bin Nasr narrated to us: Husain narrated to us, from Za’ida, from ‘Abd al-Malik bin ‘Umair, who said: Abu Burda narrated to me, from Abu Musa, who said: The Prophet (peace and blessings be upon him) fell ill, and his illness worsened. He said, ‘Tell Abu Bakr to lead the people in prayer.’ ‘Aisha said, ‘He is a tender-hearted man; if he stands in your place, he may not be able to lead the people.’ He said, ‘Tell Abu Bakr to lead the people.’ She repeated her concern, and he said, ‘Tell Abu Bakr to lead the people, for you are like the women who tried to tempt Joseph.’ The messenger came, and Abu Bakr led the people in prayer during the Prophet’s lifetime.