It wasnarrated that Usamah bin Sharik said:
"I saw the Bedouinsaskingthe Prophet (ﷺ): 'Is there any harm in such and such, isthereany harm in such and such?' He said to them: 'O slaves of Allah!Allah has only made harm in that which transgresses the honor ofone'sbrother. That is what is sinful.' They said: 'O Messengerof Allah! Isthere any sin if we do not seek treatment?' He said:'Seek treatment,O slaves of Allah! For Allah does not create anydisease but He alsocreates with it the cure, except for old age.'They said: 'O Messengerof Allah, what is the best thing that aperson may be given?' He said:'Good manners.'"
English reference: Vol. 4, Book 31, Hadith 3436
Arabic reference: Book 31, Hadith 3562