Sahih al-Bukhari Book 75, Hadith 26
`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".
The Prophet (ﷺ) passed by me while I was kindling a fire under a (cooking) pot. He said, "Do the lice of your head trouble you?" I said, "Yes." So he called a barber to shave my head and ordered me to make expiation for that."
I visited the Prophet (ﷺ) while he was having a high fever. I touched him an said, "You have a very high fever" He said, "Yes, as much fever as two me of you may have." I said. "you will have a double reward?" He said, "Yes No Muslim is afflicted with hurt caused by disease or some other inconvenience, but that Allah will remove his sins as a tree sheds its leaves."