Sahih Bukhari

Narrated Al-Qasim bin Muhammad:`Aisha, (complaining of headache) said, ""Oh, my head""! Allah's Messenger (ﷺ) said, ""I wish that had happened while I was still living, for then I would ask Allah's Forgiveness for you and invoke Allah for you."" Aisha said, ""Wa thuklayah! By Allah, I think you want me to die; and If this should happen, you would spend the last part of the day sleeping with one of your wives!"" The Prophet (ﷺ) said, ""Nay, I should say, 'Oh my head!' I felt like sending for Abu Bakr and his son, and appoint him as my successor lest some people claimed something or some others wished something, but then I said (to myself), 'Allah would not allow it to be otherwise, and the Muslims would prevent it to be otherwise