Hadith #3855 (Sunan Abi Dawud)
Book: Medicine (Kitab Al-Tibb)
Narrator(s): Abu 'Amir al-'Aqdi عبد الملك بن عمرو القيسي أبو عامر العقدي, Abu Da'ud أبو داود السجستاني الأزدي, Falayh bin Suliaman فليح بن سليمان, Harun bin 'Abdullah al-Hamal هارون بن عبد الله بن مروان الحمال, Y'aqub bin Abi Y'aqub يعقوب بن أبي يعقوب المدني
Grade: Sahih

I came to the Prophet (ﷺ) and his Companions were sitting as if they had birds on their heads. I saluted and sat down. The desert Arabs then came from here and there. They asked: Messenger of Allah, should we make use of medical treatment? He replied: Make use of medical treatment, for Allah has not made a disease without appointing a remedy for it, with the exception of one disease, namely old age.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3855/