Usama ibn Sharik said, "I was with the Prophet, may Allah bless
him and grant him peace, when some bedouins came. There were many people
on all sides. The people were silent and no one spoke except them. They
said, 'Messenger of Allah! We experience difficulty in such-and-such and
such-and-such' and it was in things which are not harmful to people. He
said, 'Servants of Allah! Allah has removed difficulty except in a case
where a man slanders someone unjustly - that is the one who is in difficulty
and destroyed.' They said, 'Messenger of Allah, can we make use of medical
treatment?' 'Yes, servants of Allah,' he replied, 'you can make use of
medical treatment. Allah Almighty did not create an illness but that He
made a cure for it - except for one disease.' They asked, 'And what
is that, Messenger of Allah?' 'Old age,' he replied. They said, 'Messenger
of Allah, what is the best thing that a man can be given?' 'Good character,'
he replied.'"